Think you mean polyester resin mixed with glass strands. Same stuff as your hull is made of, just that CSM (chopped strand matt) has a styrene binder to keep all the strands held togetherwhilst it's trimmed and laid in the mould.
Polyester filler is resin mixed with talc (Think this is usually aluminium oxide).
Polyester filler is resin mixed with talc (Think this is usually aluminium oxide).
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