Best answer
When the fiberglassis dry,mix gelcoat with methyl ethyl ketone peroxide in a bucket to activate the gelcoat. For small sections of fiberglass,apply the gelcoat with a brush. If you鈥檙e covering a lot of fiberglass,use a gelcoat spray gun to apply the gelcoat.
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How do you apply gelcoat to fiberglass roofing?
Applying the Gelcoat Combine gelcoat and methyl ethyl ketone peroxide in a bucket. Add gelcoat color pigments if you want your gelcoat to be colored. Apply the gelcoat using a brush if you鈥檙e covering a small area. Apply the gelcoat with a gelcoat spray gun if it鈥檚 a large fiberglass surface.
Can you put gelcoat over gelcoat?
Yes, you can apply gelcoat over a surface that’s already covered with gelcoat. If it’s a large surface such as a boat or a bathtub, use a gelcoat spray gun to apply a coat over the existing coat. For smaller surface areas, like a chair, apply the gelcoat using a paintbrush using short, vertical strokes.
How many layers of gelcoat do I need for fiberglass?
You’ll need at least three layers of gelcoat on your fiberglass. Let each coat dry for at least 4 hours before applying the next coat.
Do you have to sand down fiberglass before gelcoat?
You do not have to sand it down to raw fiberglass. Make sure you use proper safety equipment, like dust masks. If you DO have raw fiberglass spots, you are just going to lightly hit those spots to clean them up. These areas will usually require a second coat of gelcoat. Step #2 鈥?Clean with Acetone or MEK Solvent and let the solvent dry.