FIBREGLASS MATS / WOVEN ROVING (44). Fibreglass Mould making Kits (2). Fibreglass kits (16). Gelcoat / kits (158). DEEP GREY GELCOAT 250g kit (14306). If applying Gelcoat into a fibreglass (GRP) mould you must always add 2% catalyst, this will prevent the styrene present attacking the waxed surface which ensures the release of the part.
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