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Old 09-22-2018, 04:26 PM
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Conditioning disc or strip disc?

When to use either? I have several bags of conditioning discs (coarse) and am almost out of strip discs. The conditioning discs seem to be a cross between sanding and a strip disc? They sure work well and I find them a bit faster and easier in getting old paint & primer down to bare metal. I assume you still need to sand the bare metal with the appropriate grits prior to primer?

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Old 09-22-2018, 05:07 PM
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Ok what are you doing?

Generally you can chemical strip then wet sand which saves tons of paper and time.

But you don't want to run chemicals with or near some things like aluminum or a painted vinyl top.

Yes you want to go down to bare metal and transition into the paint that will give the primer something to stick to.

For small repairs start with 80 grit to get down to metal and then move up to 120 and 320 transitioning out.
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Old 09-22-2018, 05:35 PM
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It's on a steel car shell. Most of it is already media blasted, sanded or stripped (by strip disc) to bare metal. Just finishing off the balance of cleaning the last of remaining paint out some of the outside panels. Am getting it ready to prime in a couple of days.

The conditioning discs have AO in them which does "condition" the metal and leaves scratches which is good, but not sure how much further sanding it needs. Will be pushing it outside tomorrow or Monday to finish a little media blasting that a disc won't work on like welds.
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Old 09-22-2018, 07:59 PM
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Without knowing just what kind of discs you have there its tough to give specific input but whether I use a variety of abrasives on bare steel or just one... an orbital sandscratch follows. 80 grit on a DA sander, everwhere it can get to. On inner panels and stuff with many tight contours, the little 3" orbital angle sanders work like A DA and go well using just continuous roll paper like for blocking. I don't own one of those so am known to hand sand into corners and such. Even a red scuff pad, while it pretty much leaves no scratch, does help clean such areas. Heck, I have even just rolled up a scuff pad and chucked it in a drill before, so its whatever reaches.

But inevitably, there will be places where aside from blasting, only conditioning or strip disc abrasion is possible. Those are OK but the orbital 80 grit scratch is generally considered optimal to finish steel with. Personally, I prefer to sand thoroughly with 40 grit on a DA then follow with the 80. 40 DA is great for knocking off old paint and moderate amounts of filler too.
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Old 09-22-2018, 11:34 PM
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when I hear the word strip disc I'm thinking super fast RPM and warpage.
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Old 09-23-2018, 12:04 AM
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Quote:
Originally Posted by tech69 View Post
when I hear the word strip disc I'm thinking super fast RPM and warpage.
Talking about "cookie" discs I believe?

To OP, I use 80g cartridge rolls on a die grinder speed turned down to get in tight spots and little nooks and crannnies. A bag of one grit and an anvil is not terrible expensive and pretty handy to have and what works for me
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Old 09-23-2018, 09:51 AM
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Rice patties aren't that bad.
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Old 09-23-2018, 11:23 AM
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Now I'm hungry again. Pass the cookies, keep the patties. Are there any of those mule hide wafers left?
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Old 11-22-2018, 09:50 PM
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I bought some stuff from Empire and got a chance to try it this weekend. Among things, I got the blue Black Hawk Stripping Discs for both 4.5" and the 2" roloc. That material is awesome. I did a little experimentation on the tractor bucket. I think one 4.5" disc and a day, and I can have the tractor bucket ready for a finish Scotch-Brite and then epoxy primer.

The 4.5" disc is $5,

I also got some red conditioning pads, and used one of them to prep a car for touch-up work.

Also, Empire has flap discs with different grades of Scotch-Brite like material on them. I got one ($7) but cannot report on it, as I have not had a chance to try it yet.

Empire is almost to metal abrasives like Klingspor Woodworking is to wood abrasives. Well, maybe not close, because Klingspor has a fantastic selection of quality products, but I was impressed with my small Empire order.

Last edited by Crosley; 11-23-2018 at 09:18 AM. Reason: URL Link removed
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Old 11-23-2018, 04:04 AM
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Just do not finish your bare metal with conditioning pads. The are way to fine and do not leave a good "tooth" for your primer. As said above, you need an 80 grit DA scratch pattern on your bare metal.

John
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Old 11-23-2018, 09:04 AM
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Yep, John, you are right on there, it's like they are polishing the surface.

I am not home right now so I can't post the pictures of the stripping test I did using a number of different products that I started to put together to post but never did. The stripping discs like "hamburger" discs do an AMAZING job, as long as you use them like you would sand paper, CUT CLEAN and don't spend forever with it rubbing on the metal heating it.

I have been doing a lot of this on my truck parts and it's damn amazing how good they work over sanding, that is for sure!

Brian
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