Used this to repair a leak in the tank of my water fountain. I used a wooden spatula to spread the sealant up and down all side seams and on the bottom of all four sides. Material is very sticky as it comes out of the tube. I let tank sit for 7 days before refilling. I still have a very small leak somewhere in the top inch of the tank as leak stops when water level goes past that point.  I can't see any breach of the sealant anywhere. I used entire tube and don't have anything left to reapply, but I can live with the very, very slight leak.