So I ran into this issue as well, I actually did use ospho ( Phosphoric Acid) in the pitted areas, I mechanically stripped mine, then wire wheeled the paint and rust out of the pits as much as possible, then ospho 24 hrs, re ospho to re activate acid, wait 5 min the rinse with warm or hot water and dawn dish soap (base) to neutralize the acid, then epoxy or even blast to get the black converted rust out of the if you want. Some will say never to use acid on blasted metal, but I have and then just cleaned it really well, epoxy stuck just fine for me.
Naval jelly for those pits is actually what ya want ,its blasted and clean and it can do its job. Or some kinda acid like por-15 metal ready or evaporust,or a commercial grade type of stuff at the autobody paint store. Im not up on whats a good acid,but i know to stay away from the brown acid😂 Put saran wrap over it so it doesnt dry out and check in 24hrs if youre using evaporust or por-15 metal ready , they're a little slower and like water. Saran wrap is the deal though. Get em cleaned out and filled and it'll be fine.
So I ran into this issue as well, I actually did use ospho ( Phosphoric Acid) in the pitted areas, I mechanically stripped mine, then wire wheeled the paint and rust out of the pits as much as possible, then ospho 24 hrs, re ospho to re activate acid, wait 5 min the rinse with warm or hot water and dawn dish soap (base) to neutralize the acid, then epoxy or even blast to get the black converted rust out of the if you want. Some will say never to use acid on blasted metal, but I have and then just cleaned it really well, epoxy stuck just fine for me.
Naval jelly for those pits is actually what ya want ,its blasted and clean and it can do its job.
Or some kinda acid like por-15 metal ready or evaporust,or a commercial grade type of stuff at the autobody paint store.
Im not up on whats a good acid,but i know to stay away from the brown acid😂
Put saran wrap over it so it doesnt dry out and check in 24hrs if youre using evaporust or por-15 metal ready , they're a little slower and like water.
Saran wrap is the deal though.
Get em cleaned out and filled and it'll be fine.
Osphos acid