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Old 11-22-2009, 11:45 AM
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Rust Doctor

I am currently working on an old comet and have some rust issues..I have in the past used rust mort w/o any issues and a buddy recently gave me a gallon of rust doctor. My question is this product seems quick to discolor the rust and puts a blackish latex film over the bare metal..at this point is it best to sand back down and epoxy seal it or can I epoxy right over the blackish film without having any paint lifting down the road? Is there anyone out there that has used this product and know the longevity of what happened (lifting ) if any..
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Old 11-24-2009, 04:37 PM
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I have never heard of rust doc but I never prime over something I'm not sure of.
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Old 11-24-2009, 05:09 PM
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More than likely it's nothing more than phosphoric acid.

Vince
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Old 11-24-2009, 05:14 PM
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I've used similar stuff and found nice fresh rust under the black film.

Hit it with a wire brush and see if the rust has actually been taken care of or just hidden.
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Old 12-06-2009, 02:31 PM
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I have used this type of product before

Try to get as much of the rust off before using that product then scuff the black. Try to leave as much of the black as possible, seal and prime, block your primer and ready for paint.
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Old 12-06-2009, 03:23 PM
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As stated before, check UNDER the black and find out that you've only started to remove the rust.

Its just like covering the rust with primer.
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Old 12-11-2009, 07:13 AM
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The only thing that EVER worked for me is Ospho and a lot of sweat....all those rust converters cause more problems later
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Old 12-11-2009, 09:03 AM
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I do loves me some OSPHO but SPI doesn't. When I use it I go behind it and DA sand all the residue off of it. I don't know what happens when OSPHO reacts under the epoxy once it's sprayed but I can say that if it gets on the epoxy after its sprayed, it's going to bubble up and ruin the epoxy. Lesson learned. I still am not sure about the sticky residue that OSPHO leaves though. I don't know what it is. I just try like heck to get it off before anything else.
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Old 12-11-2009, 10:24 AM
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I know Barry wont recommend it ,But I do...Its only sticky while its drying.I also sand it before applying epoxy (SPI epoxy) It works really well...sand , wax& grease then prime Its probably the the one product I've used the longest, along with aircraft stripper....Are you wiping off the excess with paper shop rags? I try to wipe most all of it off.It sure works for me never had an adhesion problem as a matter of fact spi sticks even better when I use it than when I dont.I scrub it in with a red scuff pad and on rust I use a coarse wire wheel cup.let it dry at least 24 hrs
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