The black surface turns brown when wet? This is normal on the surface, the waterproofing is not affected. Related articles What if I don't want black as my final color? Is Liquid Rubber Waterproof Sealant environmentally friendly? Will sun have an effect on the Liquid Rubber Waterproof Sealant? What is Liquid Rubber Foundation Sealant used for? Can the Earlex Sprayer spray the Original Black Waterproof Sealant? Comments 0 comments Please sign in to leave a comment.