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 should I use to clean up? How long does Liquid Rubber MetalSafe Sealant take to cure? What is Liquid Rubber MetalSafe Sealant used for? Comments 0 comments Please sign in to leave a comment.