May 15, 2015 · Ospho, is a great product for automotive if used right, we give scare warnings because we want people to call so we can make sure they know how to neutralize it, so no …

Feb 24, 2010 · Ospho is a water-based solution and the water can hide in nooks and crannies causing adhesion failure of the primer. Old car frames are particularly susceptible to this …

Oct 11, 2015 · I just completed a crude rust removal experiment and wanted to share my results with everyone. 3 products were tested: - Ospho ($32/gal) - Eastwood’s Gel Rust Dissolver …

Mar 30, 2010 · This is the start of a thread dedicated to successful rust removal using ospho,a water based phosphric acid product I've been using professionally for many years. Ospho has …

Dec 5, 2023 · Flash rust is OK. Stuff that happens in the moments after treating it with Ospho then rinsing. If you have any black pits of rust, you need to remove them or it will fail in that spot. …

Nov 21, 2023 · Meaning after you have treated it with Ospho which will take a while to get all the surface rust off and etch a tooth into the metal. Re-wet it with Ospho and keep it wet with …

Aug 23, 2025 · Flash rust means the Ospho is neutrized in that area. I think it happens because of hard water. The iron in it. The not rusted spots might mean it's not neutralized in those areas …

Sep 9, 2022 · My understanding is that Ospho will convert surface rust, but if the rust layer isn't very superficial, I would assume that under the ospho treatment there is still deep rust. Is that …

Jun 3, 2021 · Hello all, Sorry if this is a little off topic. A few days ago I stripped a patio furniture and applied Ospho followed by Rustoleum professional primer and ready to apply oil based …

Nov 16, 2020 · Get some Ospho and follow the procedure on page 13 of the SPI tech manual. The only difference I would add is to use red scotchbrite pads with the Ospho, not a towel. A …