It Is Incredibly Strong And Can Be Used For Filling; Sealing And Shaping. Can Be Sawn; Filed; Machined & Sanded Once Cured. Can Be Used Underwater; But Is Not As Easy To Apply Underwater As Pratley Putty Original. Adheres To Metal; Cement; Concrete; Stone; Glass; Slate; Wood And Most Rigid Materials. Withstands Mild Alkalines; Oil And Petrol.