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Interfill 830 Fast Cure is the best choice for profiling above and below the waterline on Steel, Aluminium and Composite hulls. The special two-component light grey epoxy formulation can fill up to a thickness of 800 mils in one coat without the risk of sagging/slumping. Fast curing at lower temperatures and low density compositionHigh-strength and impact resistance, waterproof and easy to sandWhen sanded, the surface is smooth enough to be directly overcoated