If you layup parts of your mould too thick they can get super hot (exothermic reaction) and cause voids as well as your gelcoat to pull away from the plug. Gelcoat is sprayed into a mold before the glass fabric and resin are applied to provide a smooth pre-finished surface when the part is removed from the mold. - Polyester Type - Epoxy Type - Vinyl Ester Type - Other Type Segment by Application - Marine - Wind Energy - Transportation & Vehicle - Fiberglass Pools - Sanitary Ware . Messages. You can start with a 400 or 320 grit paper and gradually move up to say 800 grit. Most marine paints are urethanes (monourethane, polyurethane). And that is probably the source of the confusion. 2. Some gel coats are designed for epoxy to bond fairly well, but it's not easy to buy for a guy off the street and it's pricy. I wouldn't even use an automotive poly based filler on a car, let alone a boat. 1. I have tried using duratec (50%) and then spraying PVA over it. What Is Gelcoat? Gel coat will not laminate to polyester resin if it's underwater for even a short amount of time'. $14.99 ($3.75/Ounce) In Stock. The chemical bonding that allows gel coat to cure into the finished polyester part does not happen against an epoxy resin. Epoxy is more resistant to wearing, cracking and peeling, and corrosion or damage from chemical or environmental degradation. . This might not sound very different to a regular gel . the epoxy resin gelcoats are difficult for me to post finish and get a good shine. They are polyester based and absorb water like a sponge. The hardener for gelcoat is the same as for any polyester resin methyl ethyl ketone peroxide, or MEKP. Shop. Feb 24, 2012 72. This test confirms that polyester gelcoats can be applied over cured WEST SYSTEM epoxy on repairs below the waterline. Gel coat is typically sprayed in a mold and the structural laminate, or cast polymer matrix, applied behind the gel . These are good general rules when working with composites; either polyester or epoxy. If you feel that you absolutely need to have a gelcoat finish over the repair, then use vinylester resin which is a close second to epoxy but which will accept gelcoat. Cons: more ongoing maintenance (polishing/waxing), can look chalky, prone to chips. so when sprayed it can be difficult to get it to smooth out. . Gelcoat is formulated to be UV protective and stable against harmful chemical reactions. Gelcoat Without Wax (for Layups) Does not contain a wax additive, making it ideal as the first layer when building a boat hull or composite part on a prepared mold Non-sagging formula can be mixed with coloring agents made specifically for polyesters (sold separately) Catalyst: MEKP (methyl ethyl ketone peroxide), included Gelcoat is a resin system that is filled with colorants and thickening agents and applied to a mold surface to form the cosmetic and weathering coating of a composite part. Gelcoat Adhesion Test. Evercoat Coloring Agents may be used to tint the material to desired color. The gel coat is a polyester resin-based thermoset polymer or epoxy resin applied to the hull exterior in the fiberglass molding process. Yes polyester has potential to shrink a lot. 2-3 coats of that followed up with a couple coats of bottom paint and it will look like new! An epoxy's relative strength can hold up to 2,000 lbs. Sold by Fiberglass Supply Depot and ships from Amazon Fulfillment. E. etbrown4 Well-known member. The 2 part linear polyurethanes for top coating are the best if you want to paint. As near as I can tell, the bond is the same as over old polyester. Petite precision, beaucoup de gel coat maintenant, sont en epoxy. Epoxy is three to five times more expensive than polyester. The fiberglass and gel coat deteriorated in less than 60 days killing all the fish in the tank. Start by wet sanding with the finest grit to avoid adding any unnecessary sanding scratches. Gel coat is a polyester resin and uses MEKP as the catalyst. Gelcoat derives its name due to it high viscosity and ability to be applied thickly on vertical and overhead surfaces in one coat. Si tu tiens vraiment a remettre du gel coat, meule la precedente reparation et recommence en utilisant de la resine polyester. There isn't a common suitable alternative to gel coat when working with epoxy. Next video will show the results of the tests! 142 43: 5 Gallon Unit: #2. Follow by wiping the surface with a clean, dry, lint- free cotton rag. using MEK as the solvent/thinner for the Gelcoat, and then an overspray with polyvinyl alcohol (PVA or 'parting fluid') to speed the cure .. followed by flat sanding successively down to 800 grit, followed by power buffing. Anything that significantly scratches the gelcoat will also scratch the epoxy. They can be rolled on or sprayed. 6.12.3 Turkuaz Polyester Gel Coats (Gelcoat) Sales, Revenue and Gross Margin (2017-2022) 6.12.4 Turkuaz Polyester Gel Coats (Gelcoat) Product Portfolio Do not apply gelcoat to any paint or protective coating because it . Cons: no thick layer, requires primer and more fairing prep. This parting film is particularly recommended as a parting agent for separation between polyester or epoxy resins and various mold surfaces. Allow the surface to dry and sand the surface smooth with 80-grit sandpaper. What is the difference between gelcoat and paint? Check the can that contained the gel coat .. is probably " non-air inhibited " gelcoat and wont 'set/cure' in full contact with air. I am having problem with the gelcoat drying. Mais celui de l'edel est du evidemment du polyester insatur. Trial Unit: 2.31 lbs. Polyester continues to shrink and harden as it ages. Question 1: Gelcoat is used as a top-coat, epoxy is used as a structural material (as one part of a composite structure of reinforcing fibers and resin or as a putty) and a bonding adhesive. Best thing to do is apply what's called a barrier coat (it's an epoxy coating that you roll on). Quote Reply Topic: 2 Part Epoxy Paint vs. Gelcoat Posted: March-21-2007 at 11:21pm: . . The epoxy first won't hurt, but I can't say for sure how much it will help. If the gelcote cracked because flex was excessive, yes, it will fail again, over polyester or over epoxy. Epoxy finishes tend to chalk on exposure to UV light, and the esters are really designed for gel coating or laminations. 2% MEKP. Turkuaz Polyester Gel Coats (Gelcoat) Sales Proportion of Gel Coats (Gelcoat) by Geographic Area in . Remove the amine (mechanically or chemically) and provide a rough profile for the gel to mechanically attach (coarse sanding) and gel will stick to epoxy just as well as it will stick to cured polyester. Spraying gel coat is recommended for more accurate and consistent coverage. Once you have the color figured out, comes whether you want to brush the gelcoat or spray it, as we have the . We have more than four decades of experience in composite construction in the marine, aviation and industrial applications and are available to answer any questions about our products . No problems so far.must have done about 100+ repairs using this. The reason gel coat doesn't stick well to epoxy is not the epoxy per se - it the amine "blush" that occurs on the epoxy surface when it cures - especially when the air is humid. Regardless of the resin you decide to use, if the mating surfaces are not fully cured and clean it may come back to haunt you! Depending on the surface condition it would get blocked with P80 than P120 and reapply the poly, or P120, P180 and D/A with P220 and 2K. Here's 2 video of a test performed by boatwork about the adhesion of polyester gelcoat to epoxy resin. This item: White Pigment for Epoxy Resin, Gelcoat, Paint - 4 oz. Please 'Like' or 'Share' above and join the discussion below in our comments section! Gelcoat in the context of boats will always be associated with the high-quality finishes it imparts. We also found that polyester resin was harder to use the epoxy. Re: bondo and gelcoat. Hi Joe, I won't go into the actual low-level chemistry (especially because it's totally different between polyesters/vinylesters and epoxies) but essentially tooling gel-coats are very much the same family as regular gelcoats however the are engineered to prioritise certain properties (hardness, polishability and dimensional stability). Gelcoat: Pros: easier to apply (less steps), harder to scratch down to glass, easier to repair a chip/scratch. 47,184. the job is relatively straightforwardclean and prepare the surface, apply an epoxy primer, sand the primer, remove the sanding residue and then . Gel coat is basically pigmented resin you thin down with Acetone to spray.. . how to gel coat a boat, gel coat restoration near . However i thought it was pretty well known that you CAN use gel-coat ontop of west system and have a good bond. S sailsman63 Joined Mar 21, 2015 Messages 437 Reaction score 19 May 15, 2017 #7 per gallon). Wash away amine blush with water and an abrasive pad such as a 3M #7447 Hand Pad. Gelcoat is a liquid that hardens to form a thick layer that's used to protect fiberglass and give it a shiny, smooth finish. i would and this is a opinion, do repairs and spray your duratec and get it ready to spray. 13 Jul 2002. The most obvious first choice is the color of the gelcoat; we have a vast array of over 25 stock colors with the ability to color match to a sample you provide. 43 03: Gallon Unit: 11.5 lbs. per square inch. Jeff Use polyester for repairs that will be gelcoated. Far stronger bond! One part polyurethane paints are very shiny and durable, nearly as durable as gelcoat, but much better finish. In general, epoxy moulds will retain the dimensions of your plug much better than polyester will. One recent one was on a Pata Finn which is designed to flex in the bow sections above the w/l so only a 1mm layup!. Black Pigment for Epoxy Resin, Gelcoat, Paint - 4 oz. Reply. Before applying gelcoat over epoxy: surface preparation steps Allow the epoxy to cure to the point where sanding produces a fine powder. . I think you will be fine with either method. You just have to properly prep the surface before applying the gel coat. Use #122-A Gel Coat Thickness Gauge to ensure proper thickness is achieved. Nov 7, 2014; May 24, 2010. Polyester gelcoat is a pigmented version of the resin used to build fiberglass boats and other products. Some people have complained of the toxic fumes from polyester as far away as mile from the swimming pools being resurfaced in their neighborhood. You can use epoxy under gel coat. Flow Coat is formulated as a final coat that can be applied on top of layers or glass and resin. Both will bond really well. Evercoat Mold Release (# 105685) must be used to attain a fully cured surface. Still tacky after a couple of days. Apply gel coat to mold surface. Mix in MEKP at 1% to 2%. Not as good as in-mold where they polymerize together, but the secondary bond is sufficient if flex is minimal. Fiberglass Gel Coat - Fiberglass Source Gelcoat is a resin-based finishing material, that dries into a hard shell-like casing. Secondly, they do not hold water or can contain a liquid. There are also Epoxy paints that are very durable too. Step 5: Finish the Gelcoat. Joined. While epoxy adheres tenaciously to cured polyester, the reverse is not true, so the bond between an epoxy repair and an overcoat of polyester gelcoat will not be strong. the mixing generates too much heat and the gel kicks too quick. To thin the gel coat, use styrene monomer. GelCoat cures hard with a self-leveling finish, even on vertical surfaces. Boats that already have gelcoat, fiberglass, or polyester resin surface do not need any additional steps before repairing. US Fiberglass Supply features an inventory of polyester resin, epoxy, gel coat, mat and cloth, foam and the various tools to aid in any lamination project. Before coating a fully cured layer of epoxy with polyester gelcoat, prepare the surface properly to remove any amine blush. Dremeling out and filling the cracks with either epoxy or polyester filler (I tried both) did not work for two reasons. These fumes have been known to set off pacemakers and cause asthma attacks. Two types of gelcoat -. Report. Generically these include epoxies, polyurethane, and both polyester and vinyl ester. Likewise if you have the experience and can compare or contrast the effectiveness or projected life of new gelcoat vs. epoxy paint that would be of high interest too. 2. Apply gel coat in 4-5 layers at approximately 5 mils each, allowing 15-20 minutes between layers for a total thickness of 20-25 mils. This formula is also resistant to water blistering from frequent use. It's made of thick polyester resin or epoxy that protects the boat against scratches and other minor damage and lends it a shiny exterior. Correct me if I am wrong. Last edited by erospawn; Sep 29, 2016 at 08:49 AM. Figure 1. Fasco Resin Pigments are popular, non-fading, coloring agents for polyester resins, epoxy resins, gel paste, polyester fillers / putties Colors may be mixed to match shades If you desire to tint the gel coat with our coloring agents, mix the coloring agent into the gel coat prior to catalyzing the material The coloring agent can be added at a maximum amount of 1 oz. Any suggestions? Wash the fully cured TotalProtect or 2-Part Epoxy Primer with a mild soap and warm water. For any surface below the waterline I would not use a regular paint; nor would I go through the trouble of trying to geloat! Also a good single stage Acrylic urethane is works well too. Also tried a little heat. per square inch, while a polyester resin can hold less than 500 lbs. Applying gelcoat to fiberglass is simple if you have the right tools and take care to mix your gelcoat properly. Paint: Pros: harder top layer, lighter, glossy finish for years. Epoxy is a very superior material to polyester for use on underwater repairs for all reasons. Gel Kote is a non-run, non-sag formulation of flexible polyester resins to produce resiliency and toughness. Gelcoat resin usually requires 1 to 2 percent of hardener by volume (follow the manufacturer's instructions). First of all, Polyester and Vinyl ester resinsare the strength of epoxy. per quart (2 oz. It is not recommended for use with resins containing water or giving off water during cure (i.e., phenolics) or with automotive finishes, as damage may occur. Je dois faire quelques retouches de gelcoat sur mon bateau. Water Resistant GelCoat is specially formulated to be water-resistant and highly durable. ! When the life cycle costs of gelcoat are added to the initial application cost, gelcoat costs about 2-3 times more than water slides resurfaced with the SlideRenu 3-Coat Water Slide System. Effectivement, il faut absolument continuer en epoxy+pu, car la plupard des gelcoat polyester, si poss sur une couche d'epoxy, ne sechent pas. so in this case. 404. More gelcoat or polyester resin can be applied directly over this and still form a chemical bond while it still has a tacky feel. I know Polyester and Epoxy dont meld well. See all reviews. The most common gelcoats are thermosetting polymers based on epoxy or unsaturated polyester resin chemistry. $$$ - Gelcoats formulated with polyester resin are much less expensive than epoxy. Gel coats & pigments add color, increase durability and enhance the appearance of composites parts. What Is Gelcoat? Gelcoat is very expensive to apply, averaging $15-$20/sq. I am appreciative of Adams mold polishing tutorials (slope forum IIRC). Gel coat is typically the first layer of a part to be applied. I'm pretty sure the information that gelcoat vs. epoxy is a "bad idea" originates from a misinterpretation of what happens . Better adhesion and impermiability, easier to work over time, etc. One the filler shrinks slightly so it's extremely difficult to hide the crack. TAP gel coat is a high-performance thixotropic resin that can be used for touch-ups or any top-coat application. Enfin c est mon avis, et je . If your color match is reasonably good, the repair will be . Then flat sand and spray out (and feather out) the gel using a Preval aerosol spray gun, etc. The primers however are great since they will stick to the polyester and make a great "conversion" coating for your top coating. Use to fill gouges, chips, scrapes and deep scratches in the fiberglass gel coat. Other GelCoat Features However, the gel coat does more than provide a glossy, attractive finish to the boat. Air inhibited gel/polyester has a wax that comes to the the surface and prevents air from contacting the gel which accelerates the curing. Gelcoat without wax, or any other air dry product that has been catalyzed with MEKP, will generally harden, but remain sticky. Gel coats are specialized polyester or vinyl ester resin formulations that are formulated as an in-mold coating to provide appealing cosmetics and protect the underlying laminate. . Gelcoat is a resin-based finishing material, that dries into a hard shell-like casing. But I believe the manufacturers use an Epoxy based primer that has similar properties to gel coat..However, based on the above information Gelcoat could be used as well. For various reasons, some breakdown faster than others; however, they all deteriorate. . I would avoid any automotive type fillers. +. About ChromaGlast TM Premium Paint for Composites And yes, Bondo is not a good solution for most boat repairs; it does not flex much if any. Gelcoat is a big part of our business here at FGCI.When looking at gelcoat, there is a wealth of options to choose from. Too little catalyst will take too long to cure. Cost can be the second consideration. Yes epoxy is better as a barrier but that thin layer of polyester is better than nothing. Lighter areas of the hull were unaffected. After allowing the gelcoat to cure completely, you can then sand and buff your newly gel-coated surface. Description For use in Polyester Based Resins, Gel Coats and Epoxy. Although durable, it does need to be maintained consistently for its attractive finish to last. They are easy to apply in spray and roll and tip. Get it as soon as Friday, Aug 26. Gelcoat keels can be repaird in a couple hours and epoxy keels hang for days while individual layers slowly cure. ft. By far the most common are the two-part polyurethanes, as they provide the ultimate in film integrity and durability. With the addition of a wax solution, gelcoat becomes flowcoat which will cure in contact with air and thus is used on boat surfaces , GRP roofs etc. Example: If you rolled or sprayed polyester or vinyl ester resinon a surface of concrete, steel or any substrate, it would not hold water. . If, however, you are making an epoxy part, gel coat is not recommended. its also a protectant against the glass fibers as they are not water resistant. i seal All of this material will remain tacky until it is no longer in contact with the air. I could not get as good a shine as I recalled from days of using polyester gelcoat with polyester molds. EpoxAcoat GREY is a thixotropic epoxy gel coat that is widely used for hand laminating/tooling applications. I am trying to fix some gelcoat chips on an epoxy boat. Finish the job by giving the repair area a fresh coat of wax. Correct application of gelcoat is critical to get the optimum performance from it. This type of polyester resin had no wax and when we finished laying the fiberglass on the boat it remained very tacky. Gelcoat or 'Gel Coat' is a material used to provide a high-quality finish on the visible surface of a fibre-reinforced composite. Does fiberglass stick to gel coat? For top coating with gelcoat you will need to use Duratec High Gloss additive or Surface Agent to get a tack free cure. . Polyester gelcoat is not recommended for finishing repairs below the waterline. WARNING: Prop 65 Notice. Resistance to Wear. Rpondre Ulysse_66 19 jan. 2019 0 Merci pour toutes ces prcisions. Ca te prendra a peu pres le meme temps de reprendre du debut que de tenter polyester sur epoxy. Too much catalyst and the gel coat may pull away from the mold due to shrinkage. +. - Polyester Type - Epoxy Type - Vinyl Ester Type - Other Type Application Insights This report has provided the market size (sales and revenue data) by application, during the historical period (2017-2022) and forecast period (2023-2028). Yes gel coat is the most durable and yes you can spray it through a regular gun, but after it cures you have to wet sand and buff it to gloss. EcoPoxy GelCoat provides superior cosmetics and a long term protective life expectancy. The first polyester resin that we used was a lay-up polyester. . S. My understanding is that gelcoat is what is applied to the mould and on which subsequent layers or glass and resin are built up. On the backside of the gel coat (any polyester) there will be layer of uncured material due air inhibition, this uncured layer is a barrier for an epoxy to get a good bond. Our test clearly demonstrates that polyester gelcoat will bond to a properly prepared WEST SYSTEM epoxy as well as to a cured polyester laminate. Not sure if roll and tip works well. Gelcoats are modified resins which are applied to moulds in the liquid state. It dries outward and under a microscope has small holes. Normally use .5 oz. Epoxy bonds to original polyester and vinylester hulls much better than the polyester/vinylester resins. Part 1 Preparation 1 Fill in any cracks or gouges in the fiberglass with polyester filler, marine grade. In fact, a well-executed epoxy repair finished with a polyester gel coat is superior and longer-lasting than a well executed polyester repair. The polyester gelcoat on your glider deteriorates with time. Thicker coats may be used below the waterline for blister prevention, but the thicker the gelcoat layer, the more prone it may be to stress cracks. Hansson43 - 1/9/2019 2:45:52 PM. 2. Answer: Epoxy over Polyester does work if the surface of the gelcoat or polyester is properly prepared. If the exact color you need is not available, a very true color "reproduction / match" can be achieved when mixing different color pigments together to "blend" into the color desired. Gelcoat is the first layer added to a mould when making a fibreglass part - It is a thixotropic resin which forms the outer layer of the finished part. Also note that while polyester will adhere to polyester, sticking to existing Vinylester or epoxy resin may yield different success. remember gelcoat design is to be sprayed into a mold and is designed as a mold release . Keeping the surface sealed with wax and carefully removing any oxidation on the surface helps prolong its life but eventually they all break down. We offer several colors and sizes to choose from, so you can find the best solution for your DIY project. The gel coat gives the boat a smooth, shiny, clean look when it rolls onto the showroom floor. Save. Polyester is more fragile and useful for temporary .
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