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Old 05-17-2012, 10:47 AM   #1
Vegassman
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Default Sanding to bare metal?

So...started out my sanding on the trunk lid using these on my 4 1/2" angle grinder:



2 things:
1) my angle grinder is 4.5A and is struggling a little - I'll probably go get a 7A Makita or Milwaukee
2) the paint is really thick and it's taking a lot of passes to get down to the metal which wears those discs out pretty quick. There are more rigid discs available, but I don't want to wear the metal down.

When I do get down to the metal, it's got lots of swirls on it. Feels smooth though. I'll try to get pics, but before I touch any other body parts, I'd like to find out if this is a good surface to work with for prime/paint.
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Old 05-17-2012, 11:14 AM   #2
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Using a 60-80 grit on a DA sander will take the paint off quicker without the swirl.
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Old 05-18-2012, 02:53 PM   #3
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Quote:
Originally Posted by Mach1Rider View Post
Using a 60-80 grit on a DA sander will take the paint off quicker without the swirl.
+1 That's how I removed the paint on my car.
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Old 05-18-2012, 02:55 PM   #4
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Quote:
Originally Posted by Mach1Rider View Post
Using a 60-80 grit on a DA sander will take the paint off quicker without the swirl.
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Originally Posted by JTG View Post
+1 That's how I removed the paint on my car.
Sounds like a plan....can't hurt to try!
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Old 05-18-2012, 03:42 PM   #5
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i'm becoming a fan of aircraft stripper. doesn't leave dust EVERYWHERE, and is available at local auto parts stores.
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Old 05-18-2012, 03:43 PM   #6
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i'm becoming a fan of aircraft stripper. doesn't leave dust EVERYWHERE, and is available at local auto parts stores.
I'm thinking I may do a combination of both methods....finding the thick, brush on stripper for large surfaces, and clean up the edges with the abrasive methods....
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Old 05-18-2012, 04:35 PM   #7
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Quote:
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I'm thinking I may do a combination of both methods....finding the thick, brush on stripper for large surfaces, and clean up the edges with the abrasive methods....
Thats exactly what I did. Started out with my sand blaster for the hard to get places then used aircraft stripped on most of the body panels then finished it off with some 80 grit on my DA sander. Didn't take much time at all.
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Old 05-18-2012, 05:01 PM   #8
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Quote:
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Thats exactly what I did. Started out with my sand blaster for the hard to get places then used aircraft stripped on most of the body panels then finished it off with some 80 grit on my DA sander. Didn't take much time at all.
I'll drink to that plan! Is it Beer:30 yet?
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Old 05-18-2012, 05:58 PM   #9
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I actually did use the stripping disc. I did take all removeable parts to a sandblaster, replaced the quarters, and I have a convertible, so that didn't leave much to strip. My grinder is more like 9 amps, and it did OK, and I thought it was quite a bit faster than the DA sander with 40 grit paper. The problem with the stripping disc, is it will put a bunch of heat in the sheet metal so care must be used. I used 1.5 of those things before they wore out, and it did make a mess.
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Old 05-21-2012, 02:51 AM   #10
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I have used all methods from air sanders, random orbit, chemical, orbital, 9", 7", 5" and everthing in between. And by far and away the best method has been the discs you are using with a 5" variable speed grinder. Just do quarter of a panel and let your grinder cool off for a bit and find something else to do. Chemical paint stripper is god awful, only useful in hard to reach places. Yes it works but geez there is a better way.
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