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Old 06-17-2006, 10:14 AM
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Filler Over Guide Coat?

I epoxy primered my car with PPG DP, found some imperfections using spray (SEM 38203) guide coat. I know everyone here likes the powder, but what's done is done. I sanded the panels to bare metal, cleaned thoroughly with alcohol and skimmed the area, no rust on the surface.

My question is, am I alright filling over the remaining guide coat - will the filler stick? There are traces of it on the panel and the low areas have guide coat in them.

Thanks, Larry
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Old 06-17-2006, 11:00 AM
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I'm confused, how could there be guide coat if you have sanded down to bare metal?

I personally remove ALL guide coat prior to applying anything over it. If you don't you will only see it later when sanding and confuse you.

Brian
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Old 06-17-2006, 12:31 PM
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I meant that I had taken it to bare metal, guide coated and located high/low spots. Can filler be applied over any remaining guide coat.

You pretty much answered with your preference, I've already recoated the affected areas and preparing to finish sand them! Is that a definite no-no; do I need to remove the filler and go again from scratch? I assumed the guide coat remaining in low areas stayed so that I could ensure I relocated them during filiing.
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Old 06-17-2006, 12:58 PM
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It isn't a big deal that you applied something over the guide coat, it is after all a learning experiance. If you are aware of this and when you are sanding take that into account when you see it, not a problem.

It is much easier if you block out and then hand sand the remaining guide coat so you apply what ever it is your are going to next and not burying guide coat to confuse you later.



Brian
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Old 06-17-2006, 01:23 PM
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ive done similar before, and it worked out fine

i also once managed to spray a guide coat on wet primer ... took me 10 minutes to convince my coworker that the black was sprayed on while the panel was wet, and that after it was dry i used some red spray pant as my guidecoat for sanding .... the black made it look like there was a massive dent in the middle of the primer

both worked out fine, the one done wet was the prez's wifes van, saw it many times and it never showed any probs

also done many mirrors with spray paint and 2001 clear, some of which i had to use ppg base over the spray paint because the spray paint color was waaaay off ... only prob i ever had was the clear blushing because it was a horribly humid day .... but thats a clear problem ...
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Old 06-17-2006, 09:03 PM
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Larry, Don't put bodyfillers over spray can guide coat, sand any guidecoat off the metal before you skim coat the area. When you skim and sand any uneeded filler will be removed during the sanding process. Body filler can be applied directly to your DP epoxy primer so there's no need to remove the primer if you find areas that need attention, in fact filler over epoxy is much better than directly applied to bare metal.
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