To seal the space between the tiles and the top ranks of the wall, this is the perfect insulator. It gives you time to make your work and do not swell too quickly. A small test on a hollow concrete block to see the expansion of power forward, and voila. The Rubson easily be spray painted, and rendering is impeccable. We hardly see the separation between the wall and the ceiling after smoothing and painting. Take care to put crumpled newspaper behind the foam if you caulk a row of eaves for example, if your foam will flow outside. Ditto for a hole in tiles or concrete blocks, otherwise you will use much foam as necessary. Good product that does its job!
