Will Phosphoric Acid cause me more problems?
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Will Phosphoric Acid cause me more problems?
I'm doing some work on the floor pan of my 79 F150 and I'm not sure if I should cut more of it out or not. I've removed the worst part on the passenger side so far. My plan was to use phosphoric acid to neutralize the rust, then prime it, then patch the holes with fiberglass and paint everything.
Will the acid cause me problems if it gets into the seam where the floor plan sits on top of the rockers? Should I try to wash it out or neutralize it with something and then try to get some paint in there? I plan to eventually replace the floor with repair pans, but I don't want my rocker panels to start rusting too.
Will the acid cause me problems if it gets into the seam where the floor plan sits on top of the rockers? Should I try to wash it out or neutralize it with something and then try to get some paint in there? I plan to eventually replace the floor with repair pans, but I don't want my rocker panels to start rusting too.
Hotshot
Joined: Aug 2006
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I'm doing some work on the floor pan of my 79 F150 and I'm not sure if I should cut more of it out or not. I've removed the worst part on the passenger side so far. My plan was to use phosphoric acid to neutralize the rust, then prime it, then patch the holes with fiberglass and paint everything.
Will the acid cause me problems if it gets into the seam where the floor plan sits on top of the rockers? Should I try to wash it out or neutralize it with something and then try to get some paint in there? I plan to eventually replace the floor with repair pans, but I don't want my rocker panels to start rusting too.
Will the acid cause me problems if it gets into the seam where the floor plan sits on top of the rockers? Should I try to wash it out or neutralize it with something and then try to get some paint in there? I plan to eventually replace the floor with repair pans, but I don't want my rocker panels to start rusting too.
Cargo Master
Joined: Aug 2007
Posts: 2,560
Likes: 69
From: New Zealand
Phosphoric acid will only eat into the rust; it won't damage clean steel if left in the seam - unlike some acid eg sulfuric.
You can let it dry & prime over the residue, but I wash it off if it's in a place that I can dry the water up reasonably quickly.
You can let it dry & prime over the residue, but I wash it off if it's in a place that I can dry the water up reasonably quickly.
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People use this stuff all the time, no one knows for sure? I'm ready to get started but don't want to rush and end up worse off.
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Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
Phosphoric acid (like concrete etcher) won't affect the paint. Neutralize it with water, dry it off, and then wipe with wax/grease remover before applying a top coat.
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