4 replies to this topic

[minigeorge]

Hello, I am restoring my brothers mini and currently painting the floor inside the mini. I have taken it all back to bare metal but have done this over a few months so have been left with flash rust.

I have been using a rust remover, I think it's called krud kutter paint prep and rust remover. It has worked really well and removes the rust in a few minutes and really cleans the metal up well. But it says on the tub that it contains phosphoric acid and should be washed down with water. I don't really want to soak the bare metal in water so have used damp cloths but this then results in the metal going rusty coloured in a few minutes.

If I just wipe the rust remover away with a dry cloth It is then left with a very fine white coating, I guess this is the phosphoric acid. Is it ok to paint straight over this with the epoxy primer. I have done many searches online and Im getting mixed information if it's ok to paint over or if it will cause any paint problems. Thank you

[Ethel]

It is ok to paint over iron phosphate, but it's black. What you have is possibly carbonate or hydroxide, try washing it of with warm water.

[pete l]

I don't like using water either, seems a really stupid idea.

 

Try white spirits, then thinners to remove the white sprits residue.

[Mervyn]

Wash it with boiling water, only needs a light rinse. You're just removing the excess, the phosphoric is fine to leave on, just not too much.

Dry it with paper towels then heatgun it , any bare steel will want to flash rust if you've used phosphoric so hit it with a etch or zinc primer rattlecan straight away

Merv

[minigeorge]

Thank you for the replies. I have used panel wipe to wash/wipe it off and it looks to have worked perfect, also it helps that it evaporates very quickly.