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Old 26th June 2020, 11:11
Mitchelkitman Mitchelkitman is offline
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If you use PIR (Polyisocyanurate?) foam the polyester resin will stick to it but won't attack it. Builders merchants Celotex or other make (tan coloured) sheets with silver foil on one side and paper on the other is a lot cheaper than most sources - just peel off the foil and paper (stinks when you do it ). fit in place, carve to shape and cover with resin one coat of resin ('cos it soaks it up) then add resin/matting. Foam can be broken off after the GRP has set.
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