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#1
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Painting/gel coating over Epoxy
Hello Everybody,
I am just getting started building a new sailboat, I will be using a friends molds. I am using epoxy and glass but we wondering what people thought about various approaches to painting/gel coating it. What should I do? What are some positives an negatives? Thanks for any advice |
#2
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Painting/gel coating over Epoxy
If you're using 2-part marine epoxy, you have to paint it or clear coat
it. Otherwise UV rays will break down the epoxy over time. -- Matt Langenfeld JEM Watercraft http://jem.e-boat.net/ et2piei wrote: Hello Everybody, I am just getting started building a new sailboat, I will be using a friends molds. I am using epoxy and glass but we wondering what people thought about various approaches to painting/gel coating it. What should I do? What are some positives an negatives? Thanks for any advice |
#3
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Painting/gel coating over Epoxy
A few questions: Is your friends mold male or female? In other
words, will the first layer of fiberglass applied be the inner skin of the finished hull (male), or the outer skin (female)? If the former, gelcoat is not an option; you'll have to fill-fair the hull, then use an epoxy primer over which you'll apply a compatible paint. In female molds (on the other hand), gelcoat is the first 'foreign substance' applied to the mold (release agent assumed). This is almost always followed by a layer of mat, to avoid the visual 'print-through' of the heavier woven materials in the laminate. Mat must be applied using polyester / vinylester resin (which contain styrene, which breaks down the binders in the mat). Here's the problem: You're proposing an epoxy laminate; it's very difficult to properly 'tie' the polyester/vinylester layer of the laminate to the epoxy layer. You might check out: http://www.wessex-resins.com/proset/gelcoats.html looking specifically at the 'epoxy gelcoat' descriptions and procedures. Good luck! MW Los Angeles I am just getting started building a new sailboat, I will be using a friends molds. I am using epoxy and glass but we wondering what people thought about various approaches to painting/gel coating it. What should I do? What are some positives an negatives? Thanks for any advice |
#4
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Painting/gel coating over Epoxy
Thanks for the advice.
I am using a female mold, the first layer will be a thin veil, it can be used with epoxy, I have check this with the manufacturer. I will not be using a wooven cloth it will be a biaxial, but yes print through perhaps will be a problem. I was planning on just epoxy painting it after I pulled it from the mold but many people tell me that the epoxy will not release as easily as using a gel coat. So the problem for me might be a way to be assured that I can get the hull to pop from the mold. I will check out the link, for the epoxy gel coat, thank you very much. |
#5
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Painting/gel coating over Epoxy
mike worrall wrote: In female molds (on the other hand), gelcoat is the first 'foreign substance' applied to the mold (release agent assumed). This is almost always followed by a layer of mat, to avoid the visual 'print-through' of the heavier woven materials in the laminate. Mat must be applied using polyester / vinylester resin (which contain styrene, which breaks down the binders in the mat). Epoxy compatible mat is available. I've used it in a few repairs. |
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