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 I hope to build a concrete reflection pool 60 feet long, 4 feet wide, 4" deep build the base first; then the walls. Can I use Liquid Rubber to render the pond reliably waterproof? Can Waterproof Sealant be applied to Styrofoam? What if I see blisters? Can Waterproof Sealant be put on tarred surfaces? Does the product have a detrimental impact to fish or aquatic plants? Comments 0 comments Article is closed for comments.