Can the Earlex Sprayer spray the Original Black Waterproof Sealant? The Earlex is not heavy duty enough to spray the Original Black Liquid Rubber Waterproof Sealant. It has the consistency of a pudding. If you want to spray it, you'll need something heavy duty that can spray about 3000 psi like this Lemmer HP-9500. Related articles Can Waterproof Sealant be applied to Styrofoam? What should I use to clean up? Can I build my final membrane all at once? How long does Liquid Rubber Waterproof Sealant take to cure? Comments 0 comments Article is closed for comments.