G4 Sealer/Primer for concrete, lead etc - 2.5kg2. 5kg G4 seal damp out of concrete, brick, stone and wood with a non porous plastic coating that is hard wearing, tough but flexible. Being moisture cured it can be applied in poor conditions, down to 0oC and in high humidity. Features Easy to use Tough flexible coating Seals walls & floors Seals moisture out from moulds prior to laying up glass fibre 1kg will cover approximately 6m2 (single layer) Improves the bond of GRP to metal and or wood