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Old 12-01-2007, 08:06 PM
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Bare steel, epoxy prime ,bondo,time frame

If I put epoxy(spi)on bare steel do I need to start the body work in a certian time frame after that? I'm finally getting to start the body work on my nova project and don't want to mess it up right off the bat.

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Old 12-01-2007, 08:33 PM
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you should be fine,just scuff the epoxy with scotchbrite,put lots on so you dont break through.
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Old 12-01-2007, 09:43 PM
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No particular time frame to do the finish is necessary.. Lots of us use the epoxy primer to protect the metal from rusting and store the parts until we need to use them..Main thing is to get it on to stop any further rust..The 7 day window on SPI applies if you are carrying on with body and paint..If you have to wait to get the body work done..(like most of us in real time) scuff the epoxy before shooting more paint or applying any bondo..I usually scuff with 120 or 180 as part of my initial blocking..Then if I have to do any more metal work I do that...Main thing about doing it this way is that you only derust once..

An SPI user

I have tried most all of it and now do what is known to work..
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Old 12-02-2007, 08:16 AM
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Thanks for the info.I'll scuff the epoxy before I use any filler.When I'm at the sanding of the filler stage what should I do if I sand through to the metal in some spots? Feather in out and spray more epoxy over everything?
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Old 12-03-2007, 10:47 AM
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Exactly, more than likely you're going to break through the epoxy around the perimeter of your fill areas. The trick to doing this without much hassle and chance of having to reprime between filler applications is to make sure you apply more filler than is needed, shape with 80 untill close then switch to 180.

Another option that works really well for those projects than need alot of filling, skimming, etc.. is to apply two coats of epoxy primer then allow it to lock up good overnight, the next day shoot 2-3 coats of polyester primer. Now you've got a surface that can be rough blocked and any remaining low spots can be filled with filler or a polyester glaze, and the thickness provided will help protect that epoxy primer during the blocking stages. It saves time on some of the bigger projects.
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