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Old 12-28-2003, 10:17 AM
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Getting Ready to start so a few ?

Well body work is done, and I have a spray booth rented next week. I just wanted to double check a few things before I get into my fist paint job. While doing the body work I used All-Metal and spot covered with MP170 epoxy primer. The next step was to prep sand the old finish with 220 grit sand paper (per MP170 spec sheet). When I go into the booth I was going to shoot 2 coats of MP170. Followed by Omni MTK Acrylic Urethane. My paint jobber said NOT to sand the Epoxy before painting. As This is going on an old 4x4 and will see some offroad duty and will get more dents, so a show quality finsih is not needed. This is the reason I am skipping a second sandable primer. Is this right or should I.

1. 400 grit sand the Epoxy?
2. Bite the bullit and use a urethane surfacer over the Epoxy?

Thank you.

P.S Old finsh is light yellow new finish is Gunmetal grey

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Old 12-28-2003, 06:23 PM
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It's been my experience that once epoxy primer is dry you should at least scuff it with 400 or so to give the finish coat a surface to bite on.

If you're using a wet on wet technique you won't need to sand before shooting the finish coat. However, this technique should only be used if the "P" sheet lists it as an option. From what your jobber is saying it sounds like it is, or at least he thinks so.

I would check the "P" sheet and if it is indeed an option then I'd go with it. Saves time and work. You'll like the OMNI by the way. I'm using it on my pickup and for an inexpensive urethane it goes on very nicely.

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