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Discussion Forum

Re: Opinions before I paint

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08-21-2012 04:51:19

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You were right in applying the Ospho. My experience has been that anything that I have had sand blasted has had little spots of black here and there. That is rust. Right? I have had body panels with small pits professionally prepped and painted and after a few years, the paint is lifting in small bubbles from those pitted areas. You don't want that. Right? A little white residue will be left behind in pores/pits after washing, but it is loose whereas rust still down in those pits/pores is bonded as it is still working on the iron and steel. right? So your epoxy paint can get down under the particles of residue and bond to the metal but it can't fully penetrate the working rust. The residue is what is left after the phosphoric has done it's job of eating all the rust and converting it to inert iron phosphate which is in itself an excellent protective coating. So go ahead and pressure wash and brush to remove the worst of the residue, let it dry for awhile, then go over it with a liberal application of your favorite prep solvent to clean and remove moisture to prevent flash rust. I have left bare metal for days or months with no flash rust occurring but this will vary geographically, so you may need to hasten to apply primer or do it at your leisure. I have never had to worry about moisture left over from washing. I get on my soap box about this because I have to keep looking at those little bubbles on my tractors, and I don't want it to happen to you. In addition, you don't need to spend the long dollar for Ospho or Picklex or any of the many others. You can go to any dairy supply or restaurant supply and pick up gallons of phosphoric for about $10.00 per gal.

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08-21-2012 07:21:48

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 Re: Opinions before I paint in reply to showcrop, 08-21-2012 04:51:19  
I use Ospho and have painted over it the enxt day, I have never had a problem with it, been doing it for many years, But if I use lacquer primer it wont stick unless I sand it first, Will epoxy primer be what I should use?

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08-21-2012 07:49:09

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 Re: Opinions before I paint in reply to BSpauld, 08-21-2012 07:21:48  
Lacquer primer is one of the worst as far as adhesion. Epoxy primer is the best and can be used under anything, or over anything for that matter. The lack of adhesion is stated in the instructions for some lacquer primers that say sand AND use etch primer before applications. If you get by with ospho or any phosphoric acid product on cast ok, but I'm not going to try it. Mainly because I remove all the rust I can with a wire wheel on an angle grinder. IMO any rust remaining in the pores of the cast will be sealed in by the epoxy. Some may disagree with the last statement, but epoxy is as good as it gets. The only paint lifting I have seen occurred because I messed up with the application one way or another. I seldom use any phosphoric acid on sheet metal because there is zero rust when I am done. If there is any "microscopic" rust, the epoxy takes care of it. If I ever run into any (the hood on my Super M is badly pitted) I will use Picklex 20 and sand off the residue before it is painted. Picklex does not have to be washed off.

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08-21-2012 09:30:54

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 Re: Opinions before I paint in reply to CNKS, 08-21-2012 07:49:09  
I dont use it on cast either. I will get some epoxy primer, Thanks for the advice.

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