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#1450650 Thu May 05 2022 03:49 AM
Joined: Jan 2020
Posts: 107
Hello I just sandblasted my 1947 chevy truck frame. Im going to primer it using valspar epoxy primer. Do I need to sand the frame with 80 grit before I spray it with the epoxy?
Or just clean it, use metal prep and spray the primer?

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47 BOMBER #1450660 Thu May 05 2022 04:55 AM
Joined: May 2015
Posts: 5,931
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
No need to sand after sandblasting. The blasting gives the metal some "teeth" for the paint just like sanding would. Just blow the dust off and spray your primer on. Maybe degrease it if you touched it with your bare hands. I used epoxy primer on my frame and and a semi-gloss black industrial enamel over the primer.

Newest Project - 51 Chevy 3100 work truck. Photos []
#2 - '29 Ford pickup restored from the ground up.
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Busting rust since the mid-60's
47 BOMBER #1450811 Fri May 06 2022 01:02 PM
Joined: Apr 2017
Posts: 179
I have had questions about the use of sandblasting vs sanding. The data sheets from PPG only mention sanding not sand blasting. I suspect this is because sanding leaves scratches whereas sandblasting does not. Sandblasting leaves dents and pits. Here are a few pictures of sanding scratches (80 grit) and sandblasting. Also there is one showing both on the same part. I sandblast many parts before I sand especially areas where I cannot reach with sandpaper. I also find that sandblasted parts are easier to sand.


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1940 Chevy 1/2 Ton presently in pieces...
1940 Chevy Business Coupe
47 BOMBER #1450820 Fri May 06 2022 01:46 PM
Joined: Dec 2020
Posts: 240
A few good products out there. I used POR 15 ,3 coats.. and 2 topcoats.

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paint2.JPG (193.94 KB, 77 downloads)
bes.JPG (128.22 KB, 77 downloads)

1958 3100 Apache 327 engine
1958 3100 Apache Panel 1/2 ton 235 engine
1959 3100 Apache Panel 1/2 ton 327 engine
47 BOMBER #1450887 Sat May 07 2022 12:33 AM
Joined: Jan 2020
Posts: 107
I think I’ll go over the sandblasted frame with 80 grit since it’s been about a week since I’ve blasted it. Then I’ll blow it off, clean it with wax & grease remover, then apply the Valspar epoxy primer. I’m not going to use metal prep because the metal prep doesn’t recommend using it on a sandblasted metal because it’ll rust instantaneously.

I’ve used POR 15 on other projects. It’s good stuff.
Thanks guy’s

47 BOMBER #1450924 Sat May 07 2022 01:06 PM
Joined: Apr 2017
Posts: 179
I would also recommend that you use products in the same family/manufacture that way you eliminate incompatible products. Yes that can be a problem.
The manufacturer’s data sheet should tell you what products are compatible and in which order to apply them. I prefer PPG products for that reason.


1940 Chevy 1/2 Ton presently in pieces...
1940 Chevy Business Coupe

Moderated by  klhansen 

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