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Old 09-11-2006, 04:17 PM
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Question On Painting Under The Hood

I'm going to paint my '72 Duster a different color (going from gold to plum crazy purple) but I have a question for under the hood. Is there a way I can wet sand and paint the purple right on the gold without the old 1972 gold lifting under the new chemicals? I painted a door once without removing the old paint and the old paint started to crinkle and lift in some spots when I started putting on the new base color. Or, is there a primer I can spray on the old wetsanded gold , let flash then put on the purple base? Just trying to save time from all the sanding under the hood.

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Old 09-11-2006, 04:52 PM
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The only way I would chance that would be to completely degrease it, scuff it up real good, and spray it with epoxy primer as a sealer first. If the epoxy doesn't cause lifting of the original paint, it should be OK.

Aaron
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Old 09-11-2006, 04:55 PM
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Seal everything between the old and the new. A quality sealer will keep the two from interacting.
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Old 09-11-2006, 06:01 PM
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You mean scuff, seal, let flash, and paint
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Old 09-11-2006, 06:33 PM
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I would sand good, not just a scuff personally. Try around 320 dry (give or take), spray a coat of epoxy as a sealer, and paint your base and clear without sanding the epoxy, And the standard-check recommendations of the epoxy manafucturer for how much to reduce as a sealer, what grit it will fill, and time to spray base- maximum time to spray base without scuffing. If lacquer thinner softens the old paint or removes it, then you should defignately seal. You may want to let the epoxy sit overnight and start spraying the base the next day. If it was a catalyzed paint underneath, then you wouldn't necessarily have to seal, but if thats the original 72 paint underneath there, you will need to seal at the very least. If you want to be assured of no problems and a long lasting job, with all the stuff to sand around,corners under the hood anyways, I personally don't think it would be a ton more work to strip and start with bare metal. A combination of paint stripper, sanding (both machine and hand) and blasting stubborn areas will get it done, The supports are pretty safe to do some light blasting on, just try to avoid hammering any of the flat metal areas that are the outer skin. Then some epoxy as a sealer (as long as you have sanded fine enough) and paint and its going to last a heck of a long time, better then having the old 1k stuff under there. The quicky shops would probably give a quick scuff, shoot some adhesion promotor and sealer on and paint. But you know where shortcuts get ya. Be happy you don't have undercoating shot underneath there like on one hood I did. That wasn't much fun.
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Old 09-12-2006, 05:22 AM
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It is the original paint under the hood, there isn't even any primer under it (just paint). It's not just the engine compartment, I have the back side of the hood and trunk lid to do also.
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