Gel Coat Troubleshooting Guide Part 2

First time users of gel coat can come across many problems with applying the gel coat.  We will be doing a series of posts that describe the different issues and remedies for the various issues.

ProblemCauseSolutions or Item to Check for
Fading-also see water spottingPoorly Cured Gel coat uneven Check catalyst levels and film thickness-18± 12 mils}.
Improper cleaners or chemicalsDo not use strong alkaline or acidic cleaners.
Fiber pattern in partsInsufficient cureCorrect excessive or insufficient catalyst level in gel coat and/or laminate. Wait longer before pulling. Do not pull while laminate still has heat. Check for low temperature.
Transferred from moldCheck for contamination by water, oil or solvent. Refinish
mold.
Glass clothToo close to the gel coat. Should have 2 layers of cured 1.5 oz.
mat or equivalent chop between gel coat and cloth.
Woven rovingToo close to the gel coat. Should have 3 layers of cured 1.5 oz. mat or
equivalent chop between gel coat and woven roving. Use 18 I+ 2)
mils, wet.
Gel coat too thinCure laminate slower. Laminate in stages.
High exotherm of laminateUse lower exotherm laminating resin.

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