Best way to waterproof a Water Tank with Liquid Rubber DIY (Potable Water Certified)

[@ovalwingnut]

Let's crowd source a respirator for this man. Who's with me?

[@Mr1DANBOY]

How well does it cover over concrete block walls? Can you ship to US?

[@Moon888-oy8bb]

How toxic is this liquid rubber?

[@redouaneamer5946]

But is that healthy ?