The Stovebolt Site Forums The Shop Area Paint and Body Shop OSPHO'd now gooey

This is a message that I posted on the contact section of the Ospho website. Waiting on a response maybe someone can spread some knowledge my way. Thanks in advance.

Hi, I have been using your product for years. I have always used it on projects that I have never kept too long after restoration and I have not kept in touch with the buyers to know how the paint is holding up. I recently bought a 1954 Chevy 3100 pickup that I was planning on keeping for a long while. I am doing an engine swap and cleaned the engine bay, (wire wheeled, wire brushed, sanded, and ospho'd) the entire thing including the inside hood that I removed. It has left a really nice grippy surface on which to apply paint on to on most of it but some of it where it seemed to had been ospho'd too thickly or where there was existing paint has turned into a slimy almost gooey mess. There is nothing in the instructions that mentions this occurring. It talks about a chalky residue that can be brushed off which I have seen in the past but not this. What can I do to prep these slimy areas for paint so that the paint sticks. There is no way that any paint will stick to this. Please help.

What do I do guys? I have been doing some research but nothing has really come up. It's been mentioned to re-ospho and clean with dish soap and dry quickly. I thought of maybe brake clean right after. I am up for suggestions cause I know that anyone that has used this product any length of time has faced this at some point. Thanks again for the help.

Ospho is phosphoric acid, a rust treatment, I'd say the problem is using it over paint [of an unknown type/composition], when it's intended to be used on bare [rusty] metal I'd suggest stripping the gooey areas back to bare metal

Bill

It isn't just where there was a bit of paint left but also where the ospho puddled or got laid on thick.

I got a quick response back from ospho this morning and this is what they had to say.

"The Ospho is trying to get through the paint to treat the surface and it
will break down the paint and could cause a greasy or tacky surface if that
happens you will have to wipe it down with mineral spirits or paint thinner
that will help remove that surface and let it dry for you."

Last time I used this stuff, I used some degreaser followed by a pressure cleaner, followed by brake clean and it seems to be holding up. Seems like it's about the same as they are recommending. Thought you guys would like to hear what Ospho has to say about this issue.

Water rinse should do I would think. To check if any is still on, you can mix some baking soda in water and spray it on, if it bubbles theres still acid.


edit,,,
After a good water rinse, use a heat source to dry it real good.