Metal Prep for epoxy after acid treatment

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I didnt see it all ready so if its here post a link please.
I am using ospho to remove some rust. Whats the next step before I epoxy?

I also have some other areas on the truck that I will sand blast but I think I would also like to use ospho on those areas after blasting to make sure there is not microscopic rust left over. I will be using a hand held spot blaster, nothing commercial.
 
Under primers title of epoxy and rust question should tell you what you want to know. I have no way of linking the thread to this one.
 
acid is a very good cleaner but any residue left is a problem. i use a spray bottle then hose it down really well and wash with dawn soap. yes it will flash rust because it is clean and there is iron in your water. there is no stopping this. just brush it off with scotch brite and epoxy.
 
acid is a very good cleaner but any residue left is a problem. i use a spray bottle then hose it down really well and wash with dawn soap. yes it will flash rust because it is clean and there is iron in your water. there is no stopping this. just brush it off with scotch brite and epoxy.
I did a rust treatment on another project a few years back . It was a two part deal I got from the auto paint store. It said after treatment to rinse off with water also and it was ready for paint. I had asked about the discoloration and the sales guy said that was normal.
I also remember reading a post that said the proper way is to rinse off and if its white , or black that it wasnt done correctly , that it should have a prism looking affect and that is correct for epoxy.
I guess I will be looking for the same affect.
 
Your best bet is to just make better use of your hand held blaster and forget about acid treatments altogether, otherwise you run the risk of being one of those heartbroken guys who has their primer coming off the metal with no one to blame but themselves. "Microscopic rust" is less of a problem than microscopic acid residue under properly applied epoxy. If you follow the directions in the SPI tech manual exactly and avoid metal treatments, you'll be way better off.

Even if you have a history of using acid treatments under coatings, don't make the mistake of thinking that experience counts with this product. SPI epoxy does not like acid films and will fail if any is present.
 
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