Dicor RP-USP-Q Ultra Sealant Primer Dicor Ultra Sealant Primer Part 1 of Dicor's Ultra Sealant System for TPO RV roofing materials (two-part system creates a permanent watertight seal at roof edges, screw, vents, and other rooftop appliances) Must be used to prepare TPO roofing and all plastic appliances that are to be sealed Priming promotes excellent bonding of Ultra Sealant to these materials 1 Quart Use with Dicor Ultra Sealant (not included)