Flex Shot Is A Super Thick Rubber Sealant That Caulks, Bounds, Seal Virtually Everything. Flex Shot Forms A Watertight, Flexible Barrier And Is So Easy TO Use No Need For A Caulking Gun, Just Push The Trigger Nozzle For A Perfect Bead Every Time. Wont Run Or Drip, Never Shrinks Or Crack. Reusable Extension Tube Can Be Cut To Produce Desired Bead Thickness. No Running, No Dripping, No Mess. Adheres To Most Surfaces. Expands And Contracts To Fill In Huge Cracks And Holes That Cause Leaks, Completely Waterproof. Will Not Fade, Dry Crack, Yellow Or Deteriorate Due to Contact With Household Cleaners. Dries To A Supper Thick Stretchy Rubber.