Tsunami deeply enhances the surface with a wet look and satin finish - the amount of enhancement is dependent on the surface. It will protect the surface from a variety of contaminants and make cleaning and maintenance easier. Tsunami will harden joint sand which helps reduce sand washout, weeds and insect infestation. An added antifungal protects sealer film from mold, moss and algae. Tsunami is rain safe in 90 minutes. Tsunami is a solvent based film forming sealer.