G4 Pond Sealer is a moisture-cured polyurethane, with forms a non-porous seal on concrete, brick or porous stone. G4 uses the moisture in the air and substrate to cure or harden. It can be applied onto slightly damp substrates. However, it is important that the substrate is sufficiently dry to be porous so as to enable the first coat of G4 to bond and obtain a mechanical grip. G4 can be applied in poor weather conditions, high humidity and at temperatures down to zero degrees.
Coverage: The amount of G4 you will need will vary slightly according to the porosity of the substrate but according to the practical experience of the users of this product, 400g are needed per square meter. As this is a black coloured version of G4 Pond Sealer, it is recommended that 2 coats of G4 Standard be applied first, before a further two coats in the black. (This is because G4 standard provides the maximum non-porous seal and adhesion.)