Is Liquid Rubber Foundation Sealant safe for drinking water? Currently we do not have a certification allowing this use. Related articles I'm looking to seal my cement interior floor before putting on sub floor. What is the prep before applying and how is the Odor? Can I build my final membrane all at once? How should I prepare the surface? What if I see blisters? What should I use to clean up before applying Liquid Rubber Foundation Sealant? Comments 0 comments Please sign in to leave a comment.