For rust, you want phosphoric acid instead of muriatic. just keep it out of your eyes! I've used a lot of POR-15, they have a specific tank sealer that I used on my bird's tank back in '99. not a single issue with it. I started with POR when it first hit the market and did a lot of tech articles and gave them a lot of feedback from those. With POR, read and follow the directions to the nth degree. It gets a lot of negative rep from those who don't and watch it peel off their work in big sheets. The subframe, suspension, entire underbody and interior of the bird were done in POR silver and black. (back in 99, and again holding up very well) to save $s you can substitute ospho or any other brand for POR-s metal etch, it's all just phosphoric acid.
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