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 problems will arise.

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 because of the …

Oct 10, 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 ($38/gal) - …

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. Try …

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 IDK for sure. …

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 just …

Dec 3, 2025 · I have searched for a couple hours now and cannot seem to find a good picture that mimics my parts. I stripped these parts, osphoed them and scrubbed the ospho in well with a red …

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 Ospho for 10-15 …

Jun 25, 2023 · My plan was to Ospho entire vehicle and neutralize/wash when ready to epoxy. My question is what effect will Ospho and water have on my finished filler? I also was reading some …

May 12, 2025 · I'm really doubting an ospho reaction and more suspicious of pigment migration, which looks like a lot of craters in an area. It happens instantaneously if you blow excessive air on the epoxy.