Flex Paste Is A Super Thick Rubberized Paste That You Can Spread, Shape, Form And Seal Virtually Everything. Starts Out As A Thick Paste And Dries To A Strong, Flexible, Rubber Coating. It Can Be Applied To All Types Of Surfaces To Seal Out Air, Water And Moisture. It Clings To The Surface And Instantly Fill Large Gaps, Cracks And Holes. It Wont Shrink Or Wash Away. Can Be Painted To Any Colour. Can Be Apply On Wet Or Dry Surfaces And Even Underwater. Expand And Contracts Never Shrink Or Cracks. Perfect For DIY Projects Crafts, Hobbies And More. Withstand A Wide Range of Temperature From -40 F To 200 F Once Fully Cure(Apply In Temperature Between 0-150F). Seals Out Elements. Fits Standard Caulking Gun Not Included. Work On Wood, Glass, Tile, Concrete, Aluminium, Metal, Brick, Stucco, Masonry, Copper, Fabric, Fiberglass, Ceramic, Porcelain, Natural Stones, Roofing, PVC, EIFS, EDPM, CSPE, Hypalon Polyurethanes And Much More. Paintable, Non- Flammable, Never Shrinks, UV, Chemicals And Mildew Resistant.