Probably would have to use your garage to be out of the sun? Unless this stuff can be resealed for later use.
Can't re-seal & use later. Pot life is like 10 hours after you add the catalyst. We'd have to coordinate it on a Saturday when you plan on lining your interior, I'll bring my hood over & put a first coat on your tub, then do my hood and repeat.
As far as the Monstaliner, I've heard that it has to be applied over paint. You guys that have done resto's or even just small areas of rust removal, what did you do with the bare metal before applying the monstaliner? Just shoot it with some primer?