Rust on Bath Tub About to Be Refinished
I am about to use a paint on epoxy to refinish a bath tub. I would just buy a new one, but this one is an odd size. Anyway, there are a few small rust spots the size of small drips. The tub is metal, but porcelain is ontop of it. I'm not sure how to tell if the tub is bleeding through or not. I've tried TSP, scrubbbing bubbles, soft scrub and these few spots just won't come off.
I was thinking of muratic acid maybe? Will that ruin the tub or the PVC drain pipe?
Any ideas to get rid of this rust? How critical is it for the tub to be perfect?