Heng's 311 Self-Leveling RV Sealant is a specially formulated, flowable, neutral-cure silicone sealant designed to seal joints when installing roof vents, air conditioning units, skylights, satellites, and more on RVs and trailer roofs. Heng''s 311 provides excellent adhesion to most common substrates without the use of a primer and remains permanently flexible. Allow sealant to cure for at least two hours before exposure to water. 10.1 fl. oz. tube. SPECIFICATIONS:* Weight: | Heng's 311 Self-Levelling RV Sealant, White