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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