G4 is a moisture cured polyurethane which forms a non-porous seal on concrete, brick and porous stone. G4 uses the moisture in the air and substrate to cure and harden. G4-Colours. When using coloured G4 the first two coats must be G4 clear. This is because the G4 clear provides the maximum non porous seal and adhesion. A further two coats of G4 coloured can now be added.
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