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