By shakir - 2/12/2018 3:12:21 AM
I have sprayed 600 microns of gelcoat fire retardant.After 24 hours curing when i sand the surface for finish with 400 grit sanding paper whitish spots become visible on the surface which become more prominent after clear coat sometimes resin tearing or resin separation although i spray layer to layer with flashoff time 20~30 sec. 1% of MEKP used.
Last time i had checked the airline but there were no any contamination and air line was completely dry.
   
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By Hanaldo - 2/12/2018 12:21:01 PM
Yes, but gelcoats arent really designed for that, they do have a minimum catalyst ratio as well as a minimum thickness to cure properly regardless of the temperature and it tends to be a fair bit higher than laminating resins. For example the gelcoat I use cant be catalysed less than 1.75%, regardless of temperature. Generally this means you just cant do much when it is too hot, which sucks but its just how it is.
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