I love Evaporust!

Dana67Dart said

I was looking into the what if of building an above ground swimming pool the shape of my Dart convert, adding weighted containers to reduce the volume of liquid needed in the passenger compartment, trunk, engine compartment and soaking the entire car.

BUT... it's still a **** ton of Evap o rust.

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As long as it stays wet, it works. They actually do use swimming pools and circulate it with pumps to keep it as wet as possible.
I did a roof on a 1953 chevy with it. High quality shop towels and cover it with plastic. Saran type plastic. I use car cover plastic for bagging cars. I did it twice 48 hours at a time. It worked pretty good. A light blasting after that.