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A feather weight thixotropic powder, which is used to thicken resin & gelcoat and for bonding & filleting applications. Laminating resins contains approx. 1% by weight, gelcoats approx. 3% by weight to avoid draining before it has hardened . As gelcoat cannot be used with flexible rubber moulds because of air inhibition, resin can be thickened with colloidal silica to produce a non-air-inhibited gelcoat.