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 How long does Liquid Rubber MetalSafe Sealant take to cure? How should I prepare the surface? How do I cover gaps and cracks? Is Liquid Rubber MetalSafe Sealant safe for drinking water? Comments 0 comments Please sign in to leave a comment.