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Old 01-17-2011, 02:48 PM
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What Discs for Rust & Paint Removal?

I've been looking at the following options today;

Flap discs
Aluminium oxide discs
Twisted wire cup brushes

When and where are these pieces best used?

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Old 01-20-2011, 08:02 PM
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Anybody?

Which discs should I use fir stripping my chassis?
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Old 01-20-2011, 08:07 PM
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you will need all of them!
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Old 01-20-2011, 08:19 PM
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Are different discs suited to different applications?
ie; flap discs for smoothing welds

Or are they much of a muchness, and you just use which ever disc fits into the area that you're working on?
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Old 01-20-2011, 08:29 PM
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Quote:
Originally Posted by ant_8u
Are different discs suited to different applications?
ie; flap discs for smoothing welds

Or are they much of a muchness, and you just use which ever disc fits into the area that you're working on?
thats about it

flap disc are great for dressing up welds
and all of them you will use where you can
wire wheel and/or cup for corners and tight spots
oxide disc for out in the middle flat spots
etc.
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Old 01-21-2011, 09:01 AM
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Save the flap disks for tougher areas - rust, welds, filler. They can warp or remove metal if not careful and will round corners and body lines. The oxides work pretty good for paint and even rust. Get plenty of them! You can use from 1 to several for just a hood, so plan ahead. I hardly ever use wire wheels, but that's just me - if I were fighting undercoating or tight areas and smaller parts, I'd likely use them more. You'll find out what works for your style.
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Old 01-21-2011, 09:23 AM
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At present I'm looking at removing surface rust and flaking paint from my chassis

It's a basic frame, with just a few brackets and outriggers on the two main frames
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Old 01-24-2011, 03:30 PM
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What grit flap disc should I use for dressing my welds?

I can get 40, 60, 80, and 120
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Old 01-24-2011, 03:38 PM
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80 or coarser, all will work
depends on how smooth you want it
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Old 01-24-2011, 03:58 PM
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The "Tools" section of our Rust wiki article lists a few recommended discs from 3M.
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Old 01-24-2011, 07:40 PM
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http://www.lehighvalleyabrasives.com/servlet/StoreFront
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Old 02-14-2011, 08:32 AM
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Thanks guys

Should I go for Aluminium Oxide flap discs, or Zirconium?

Does it make any difference?
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Old 02-15-2011, 12:49 PM
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almost sounds like you"re thinking about using an angle grinder with a grinding disc to strip paint off of sheet metal. no way would I do that except with a wire brush. use a d/a sander with 80 grit to strip paint
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Old 02-15-2011, 01:52 PM
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Yeah, when I started this thread I wasn't very informed, but I'm getting there

This is where im at right now......

I have bought various sizes of twisted wire brush for my grinder - for rust removal on the chassis

And a DA with 80 grit - for the paint on the body

There are a couple of patches on my chassis which have been welded up
They're good looking welds, but I wanted to get rid of the patched look

I thought this was impossible until Matt told be about Flap discs, I had thought I'd have to replace the effected areas, but I'm much happier now I know I can smooth them out

I've never seen or heard of flap discs until recently
I didnt think theyd be very 'tough' but then I watched a couple of videos on YouTube - damn they're nasty!

As far as the different flap discs, I was planning on getting the aluminium oxide, as they're cheaper, and the ones without their own thread to screw onto the grinder, again because they're cheaper - I'm guessing I should buy the cheapest ones as I'll go through them pretty quickly

Is that right, should I just see them as a consumable, or would I be better off spending some more money and getting some expensive discs?

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Old 05-30-2011, 10:48 PM
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Quote:
Originally Posted by bonfire
almost sounds like you"re thinking about using an angle grinder with a grinding disc to strip paint off of sheet metal. no way would I do that except with a wire brush. use a d/a sander with 80 grit to strip paint

I'm just curious because I am still learning, but why is an angled grinder not a good idea? I only ask because I have used that with 3" scotch-brite conditioning pads, and it removes paint easily without harming the metal. Am I causing a problem down the road?

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