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Altex Yacht & Boat Paint Polyurethane Undercoat is a high performance, sandable undercoat which exhibits a number of significant advantages over existing PUR undercoats. By combining new technology polyurethane binders, Altex Polyurethane Undercoat features excellent build characteristics & superior water resistance, coupled with low temperature cure & extended pot life. The sanding qualities are second to none. Polyurethane Undercoat is recommended for: Use above the waterline only Maximised adhesion when transitioning between epoxy undercoats and the selected polyurethane finish coat - in all marine situations Direct application to sanded, aged polyurethane topcoats for “Two step – Two coat” maintenance repaint work Exterior topside & superstructure final sealing to provide a fully recoatable surface for extended periods before sanding & finish coating Application over all AY&B epoxy systems Excellent build tolerance up to 100µm DFT in a two pass application Superior sanding properties Wide maximum over coating times for easy project management