Is Liquid Rubber MetalSafe Sealant environmentally friendly? Yes, it is a water based product containing no solvents or VOC's (volatile organic compounds). Related articles Can I use RV Roof Coating on a Metal Trailer Roof? Will sun have an effect on the Liquid Rubber MetalSafe Sealant? How long does Liquid Rubber Waterproof Sealant take to cure? Comments 0 comments Please sign in to leave a comment.