OSPHO factory response - Hot Rod Forum
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 …
The Ospho Solution..(rust removal) - Hot Rod Forum
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 some …
How to neutralize Ospho - Southern Polyurethanes Forum
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.
Rust Removal Product Comparison Results - Hot Rod Forum
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) - …
How do I apply OSPHO, Remove & Neutralize on My Under Floor
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 …
How to know if Ospho is Neutralized - Southern Polyurethanes Forum
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 …
The Ospho problem - Hot Rod Forum
May 8, 2015 · The Ospho applied to the back side of a rusty panel will not penetrate through the rust to neutralize it all the way through. For the Ospho to work, it must be able to penetrate all the way to the …
The Ospho Solution.. (rust removal) | Page 2 | Hot Rod Forum
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 some …
Black Epoxy and Ospho Reaction | Southern Polyurethanes Forum
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.
Flash rust after ospho for epoxy primer | Southern Polyurethanes Forum
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. …