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G4 is a one component polyurethane resin that contains solvents. It is applied in thin coatings, hardens by the release of solvents and cross links with the moisture in the air. It has a highly abrasion resistant gloss surface. G4 has a brown translucent colour and is not resistant to UV light, it will yellow over a period of time when exposed to sunlight. G4 has excellent adhesion to wood and metal provided the surface is grease and oil free, clean, porous and dry. Metal surfaces should be thoroughly sanded. G4 cannot be applied to bitumen or other coatings that are not solvent resistant.