Next up was RUST-OLEUM Rust Stripper, a bit better than the vinegar but still as effective as sucking a titty through a sweater. Instructions said leave it on for 10 minutes. We gave it a bit more time, but all it did was expose some tiny bare spots here and there. It could be done, but we didn't have 50 gallons of this stuff. We only tried it on half the roof so we could compare the results to the sand paper side.
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