Can I go over light rust with MetalSafe Sealant? Yes, you can go over light rust with MetalSafe Sealant. It has a corrosion inhibitor which removes the need for priming. Related articles What is Liquid Rubber MetalSafe Sealant used for? Do I have to coat Liquid Rubber Seam Tape? How should I prepare the surface? How long does Liquid Rubber MetalSafe Sealant take to cure? Comments 0 comments Please sign in to leave a comment.