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 Is this product good for adhering to wood. I'm looking to waterproof a 1/2 whiskey barrel for ponding ? How should I prepare the surface before applying Waterproof Sealant? Can Waterproof Sealant be put on tarred surfaces? How long does Liquid Rubber Waterproof Sealant take to cure? Comments 0 comments Article is closed for comments.