Quote:
Originally Posted by nsb29
According to SPI tech sheet if you’re going to use a rust converter use ospho. I personally don’t like using it do it right get rid of the rust don’t cover it up
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Good to know! Sorry I remember this was debated on the SPI forum and I thought Barry said there’s already phosphoric acid in their primer and using it beforehand could be costly. But obviously not.
Rust can be hard to get rid of when it’s buried in tiny pinhead sized pits or crevices. Sandblasting is the only decent way to get rid of it mechanically and sometimes that isn’t an option or can cause more problems.