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Old 03-26-2019, 05:17 PM
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BC/CC over single stage urethane ?

I have the front sheet metal off a Camaro and will be putting it all in 2k epoxy primer/sealer. I would then like to jam the areas that will be hard to paint later with single stage. It will be some time before it sees a full paint job and that will, most likely, be BC/CC. Will there be a conflict with adhesion of the bc/cc to the single stage later ?

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Old 03-26-2019, 05:39 PM
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Originally Posted by Too Many Projects View Post
I have the front sheet metal off a Camaro and will be putting it all in 2k epoxy primer/sealer. I would then like to jam the areas that will be hard to paint later with single stage. It will be some time before it sees a full paint job and that will, most likely, be BC/CC. Will there be a conflict with adhesion of the bc/cc to the single stage later ?
None at all Mitch. The single stage urethane will be an excellent foundation for the BC/CC.

When the time comes, I would suggest putting an oz of hardner in each sprayable quart of Base. That will assure no problems touching up if you break through the clear while color sanding and buffing.

John
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Old 03-26-2019, 06:29 PM
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Thanks John. It won't be me doing any sanding or buffing, that will be for a real painter. I just want to jam the underside of the cowl grille, fenders and front valances for now.
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Old 03-26-2019, 08:21 PM
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Thanks John. It won't be me doing any sanding or buffing, that will be for a real painter. I just want to jam the underside of the cowl grille, fenders and front valances for now.
Cool. You will be in good shape.

John
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Old 03-27-2019, 06:30 AM
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Now you have me thinking. If the single stage is a good base for future bc/cc, why not put the parts all in color ? Wouldn't take much more product for that.

Snowball, rolling downhill FAST... next thing I know, I'll be stripping the body and having it dipped...

NOT !!!!!
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Old 03-29-2019, 05:40 PM
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Just did take time to re-read this thread.

There was something I wanted to be sure about... the adhesion inquiry vs the places in question.

The reason you ask this is because the single stage would be unsanded in the difficult access areas, is that correct?

I ask because if so, and if that wasn't clear to John, the answer may change. I didn't think of that until now, but putting 2 and 2 together, I wonder. And of course he or I could guide you if thats what you meant.

In any event, here is a potentially relevant and probably arguable tangent to consider:

The underside of horizontal panels, with the kinda-sorta exception of hoods, can get by with minimal weather protection. To a lesser degree, the same holds true for vertical panel interiors not included in the engine compartment. Condensation can only collect and stand on top of a surface. On clean bare steel , I can bear witness that thin lacquer primer is good for 50+ years unless water can collect there. Lots of folks think of corrosion protection as having to be everywhere but physics gives us a break here. Truth be known, any glossy uncatalyzed topcoat paint will do (IF rust has not started there) for the rest of our lifetimes. Probably even where you are, if the area in question is not directly exposed to weather and splash. Rustbuckets I cut open here were driven on salt like anywhere else north of Texas.
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Old 03-29-2019, 06:10 PM
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I plan to SPI epoxy every square inch of the panels before jamming the hard to spray areas. Truthfully, the front end would most likely get blown apart for a complete paint anyway, so the jamming may be a moot point. I have taken that thought a little further lately and am considering putting the full front clip in color, rather than leaving it in gray primer. Once the primer, or paint is cured, they both would need sanding in the future, so color would be fun while waiting. I did that with the front clip and doors on the '66 Chevelle 8-9 years ago, so it would look OK while waiting for the full resto.
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Old 03-29-2019, 06:35 PM
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Well, heres a middle-of-the road solution you might consider which is rooted in high production type work:

Apply primer-sealer (not talking about epoxy, but it could be that) and color in customary wet-on-wet manner over the entire panel inside and out, with full color coats on the jambs but only put one coat of color on the panel face. Be sure to add that tiny tiny snort of suitable catalyst in the base color as John suggested. Now clear the jamb side fully and just let whatever blows onto the panel face, blow. The idea for me as a painter was so that bodyman can hang it (let's say... a door or fender) and stop there, then bring it back and its an easy mask-up / sand and foolproofs blending color to the adjacent panel plus its already sealed and almost the right color. Another coat won't hurt anything either, if its transparent and blotchy like perhaps white.

An alternative to putting catalyst (not for the buffing reason) would be to spray an uncatalyzed "midcoat" or "cut-in" clear to protect the light application of color on the panel face and keep it valid for easy scuff sanding later. Thats just a clear basecoat, ask your paint supplier if such a product is available and advisable if that sounds interesting. It would be applied to the panel face only just prior to real clear on the jamb side.

GM did leave most stuff that faces the earth in black e-coat and FWIW, I don't mind it. Body color inside and out on everything is great but is a far cry from looking stock. In my humble opinion, you'd do fine just letting the epoxy be it for most of those places and just letting the white go where it goes.
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