The Dicor Non-Leveling Ultra Sealant is a high-performance polyether sealant that contains no solvents or isocyanates and is non-yellowing. It's designed to fill voids and joints and seal around an RV's roof perimeter and other rooftop accessories where a non-leveling sealant maybe preferred. Ultra Sealant is fast curing, highly weather-resistant, and can be painted with most paints. NOTE: Polypropylene RV roof accessories and some membranes MUST be primed with Dicor Ultra Sealant Primer prior to resealing. Designed to fill voids & joints & seal around an RV's roof perimeter Fast curing & highly weather-resistant Can be painted with most paints | Dicor Non-Leveling Ultra Sealant, White