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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Body - Exterior> Will epoxy primer fill 120 orbital scratches?
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Topic Review (Newest First)
04-26-2012 04:45 AM
novafreek6872 Well, I went ahead and went over all the parts again with some 150 again on the orbital, just too be safe. I would have used 180, but it was unavailable. Then I used a scuff pad over everything. I'm sure it will be fine if I do the 2 wet coats and allow plenty of cure time.

Thanks for the tips on this one, there will be more Q's along the way I'm sure.

Andy
04-25-2012 05:13 AM
novafreek6872
Quote:
Originally Posted by jcclark
SPI epoxy, and most others will fill 120 grit scratches easily. Period!
I have filled 80 grit scratches with SPI epoxy many times
and never had a problem. (2 full strength wet coats)
The key is to have it cured enough before sanding that the
primer doesn't shrink after the sanding and the scratches show again.
I always let it cure 2 days out in the sun before sanding.
As long as you allow enough time after spraying for it
to cure before sanding you're fine.
The longer the better, everything shrinks, even epoxy.
thankyou sir!! sounds like a great plan!!

Andy
04-25-2012 04:55 AM
jcclark SPI epoxy, and most others will fill 120 grit scratches easily. Period!
I have filled 80 grit scratches with SPI epoxy many times
and never had a problem. (2 full strength wet coats)
The key is to have it cured enough before sanding that the
primer doesn't shrink after the sanding and the scratches show again.
I always let it cure 2 days out in the sun before sanding.
As long as you allow enough time after spraying for it
to cure before sanding you're fine.
The longer the better, everything shrinks, even epoxy.
04-25-2012 04:04 AM
novafreek6872 alot of conflicting info going on here...
04-24-2012 11:35 PM
johnyIROC
Quote:
Originally Posted by 35WINDOW

It all depends if he is talking about 120 grit on bare metal, or 120 grit on filler or paint.

120 scratches on metal is nothing... but 120 grit scratches in filler or paint is an entirely different story and would be difficult to fill with an epoxy primer.
04-24-2012 07:00 PM
novafreek6872
Ive already got non SPI on the way

OK... so then most non SPI epoxy primers should be just fine with the 120 grit???

I'm thinking about 2 wet coats of epoxy, guide coat, block with 220, then finish up 320, 400 wet, 600 wet then tack it off and top coat.

Is that a plan? Or am I thinking the wrong way about this?

The parts had very nice paint on them and no bodywork needed, but I'm painting them black and want the primer to be super flat.

Open to any and all suggestions

Thanks

Andy
04-24-2012 05:12 PM
Old Fool SPI epoxy will fill 80 grit scratches. It will build nicely too, just not as quickly time wise as poly or urethane primer. Sands very nice to boot.
04-24-2012 02:55 PM
35WINDOW
Quote:
Originally Posted by johnyIROC
With scratches that deep, I would seal it with epoxy, then shoot a high-build over that and sand it. It is so not worth it if you see sanding marks in your final product.

04-24-2012 02:12 PM
johnyIROC
Quote:
Originally Posted by 35WINDOW
I have filled 80 grit scratches with SPI Epoxy (not necessarily recommended), but then it does seem to have a higher solids content than most......

edit: I generally spray two heavy coats-oh, and I don't have anything on my Car except Epoxy-
With scratches that deep, I would seal it with epoxy, then shoot a high-build over that and sand it. It is so not worth it if you see sanding marks in your final product.
04-24-2012 02:05 PM
35WINDOW I have filled 80 grit scratches with SPI Epoxy (not necessarily recommended), but then it does seem to have a higher solids content than most......

edit: I generally spray two heavy coats-oh, and I don't have anything on my Car except Epoxy-
04-24-2012 01:55 PM
novafreek6872 well, I googled and it appears it will be ok... I would rather have the expert opinion of the hotrodders forum...

Looky what came in the mail today...



andy
04-24-2012 05:32 AM
novafreek6872 ...obviously i plan on blocking the epoxy down and wetsand 600 before paint...
04-24-2012 04:56 AM
novafreek6872
Will epoxy primer fill 120 orbital scratches?

I have a few pieces ( hood, decklid, cowl) that may not require high build 2k, will epoxy be enough? how many coats and how heavy should i lay in on there? If just the epoxy will work, it will be my "sealer" and final prep before paint.

OR, do I need to sand again with less grit?

Thanks guys as always.

Andy

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