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Old 05-24-2005, 08:44 AM
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primer not sticking?

Ok I was doing some last step prep before paint when I decided to redo a very small spot on the Q panel and I sanded through to the metal. What I noticed is that the primer will not feather at the edge it does not seem to try to peel but it leaves a distinct edge that can be felt if I run my hand across it. I am using all Nason paint and primer except the epoxy base coat which is the problem it is Omni 170. The bare metal was DA'ed with 180 and the primer was mixed according to the spec sheet and the temp that day was about 70 deg. I don't know much about the Omni 170 epoxy and I only used it because I had it on hand a friend gave it to me about a year ago when he closed his truck shop. Is what I described a problem? Do I need to sand this thing down to the metal again and get a better epoxy?

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Old 05-24-2005, 08:57 AM
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The 170 epoxy is not intended to be block sanded as far as I know. It's intended use is as a single coat adhesion promoter and then you are required to shoot 2 or 3 coats of primer/surfacer over it to finish the blocking.
Mark
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Old 05-24-2005, 09:49 AM
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Astro-I applied the 170 to the bare(cleaned) metal and followed about 8 hrs later with Nason 421-20 activated primer-surfacer which seems to stick to the epoxy ok but the epoxy does not seem to be sticking to the metal like it should. I hope my concerns are unfounded but if I do have a problem then I need to correct it before I shoot the top coat. The high-build 2 part Nason primer I am using will cover this edge ok but I am concerned that it will come back to haunt me later.
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Old 05-24-2005, 08:12 PM
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The problem is the 180 DA-ing of the metal, 80 is what you want to use.

Now this is a tough call as it has weak enough adhesion not to feather out but enough adhesion not to peel.

It may be fine long term and not as strong as it could be but for normal use may not be a concern.

Tough call on your end.
As Voc affects the resin makers were seeing more and more of what just happened to you. In the past 180 on metal was fine for epoxy but now it should be 80 or courser.
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Old 05-25-2005, 06:37 AM
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Not sure how big of hurry your in but before you start stripping there are a couple of tests you can do, to help make that decision.

I'm working with a jobber in Dallas today but cell phone is 404-307-9740 if I can help.

I don't carry phone in shop so leave message if you miss me and will call back.
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Old 05-25-2005, 03:53 PM
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Barry-By the time I got back here I have already started stripping this thing, at this point it is only primer and not all that big a deal. I guess I was hoping to hear that what I have is normal for epoxy and nothing to worry about but since there is a question mark here I will just strip it and not have it bugging me when I apply the topcoat. I will use 80 grit this time and I probably will use a different epoxy also. Thanks for the info.
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