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Old 10-24-2010, 06:32 PM
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how much prep for epoxy primer

so here is a green horns (me) question... how much prep do I need for epoxy primer. I have 54 Biuck with surface rust (seems Like) every where, do I need to sand down to bare metal? can I use a rust convertr before spraying the epoxy primer? I am thinking of using the rustconverter after a good sanding and then brushing all the nooks and crannies. then I want to squirt the rust converter on and brush it around, it dries hard and will only be under fenders and inside area other than exterior. Go easy on me, im just a back yard wrench!

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Old 10-24-2010, 11:09 PM
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No rust converters are used in our shop, and I know of no professional shop that will confess to using them. In short, they are a junk product sold to willing dupes that think they will save time and do their rod some good.

While you might save time, all you will be doing is covering up a problem that will come back sooner rather than later. Also, you can never be assured of adhesion between these so-called converters and the epoxy you chose without extensive testing. Bubbling and delamination of the paint job might occur even before the rust you tried to hide becomes a problem again.

Sand as much of the panel as you can, and look into alternate methods for the more stubborn areas, such as media blasting for instance. There are numerous threads on this board that deal with the problem of rust removal.

Epoxy likes nice clean metal, and even perhaps properly chem treated depending on the product (read your tech sheet). I don't believe you will find one that states it is compatible with "rust converters."

Good luck.
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Old 10-25-2010, 06:31 AM
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Phosphoric acid has been used sucessfully for many ,many years,Navel jelly and Ospho are two products that I know work well ,I prefer Ospho and have used it for many many yrs at other shops and my own .In MOST cases I prefer it over media blasting..Media blasting has its own draw backs so read up on the pros and cons of both ..Heres a few threads That'll get you started http://www.hotrodders.com/forum/sear...archid=3770357
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Old 10-26-2010, 02:23 PM
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link doesnt work, try again
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Old 10-26-2010, 03:18 PM
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Hmmm,worked before....http://www.hotrodders.com/forum/sear...archid=3773027
theres a lot of good info here ...
or just hit the search button at the top of the page with something like "rust" or metal treatments ,any subject you want.
To get the link above I searched "Ospho" ,thats what I use for rust and etching metal for primer.

Last edited by deadbodyman; 10-26-2010 at 03:32 PM.
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