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Removing mill scale-paint-rust

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Removing mill scale-paint-rust

Postby homeboy » Sat Jan 14, 2017 10:27 pm

Somewhere a while ago I saw a post from someone wondering the best way to clean mill scale from hot rolled steel without marring the surface underneath. I just started using a 3M product called a Large area paint and rust stripper. Its a 4in dia.x 1in wheel that looks a bit like heavy duty black candy floss with embedded abrasives. I use it in a high speed drill ( 3400 rpm ). I found it in the auto body shop supply section at Canadian Tire. As it wears it keeps exposing fresh abrasives and doesn't develop a set like a wire wheel. Don't know maby a lot of people use these thing but I just ran into it. It works really fast and easy on mill scale-paint and rust and seems to wear very well. :D
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Re: Removing mill scale-paint-rust

Postby Poland308 » Sun Jan 15, 2017 1:40 am

I've used them too. I like them a lot. I use it in a drill and in my end grinder.
I have more questions than answers

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Re: Removing mill scale-paint-rust

Postby tonij » Wed Feb 01, 2017 6:12 pm

I purchased one of these recently for my angle grinder to remove paint off some sheet metal. It worked really fast without gouging the steel.
I also learnt you should avoid the edges and corners with these as they get torn apart in no time but on flat surfaces they are great.
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Re: Removing mill scale-paint-rust

Postby One of a kind » Tue Feb 21, 2017 11:19 am

I use a stiff 3"cup wire brush on my 4 1/2" grinder for removing rust, paint and weld BBs.
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Re: Removing mill scale-paint-rust

Postby AndersK » Tue Feb 21, 2017 11:32 am

Norton Blaze Rapid strip
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Re: Removing mill scale-paint-rust

Postby Coldman » Tue Feb 21, 2017 4:13 pm

Sometimes wire wheel doesn't remove the rust it merely polishes it but it's still there. 3M Strip disc is the bomb.


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Re: Removing mill scale-paint-rust

Postby homeboy » Tue Feb 21, 2017 10:06 pm

I use wire wheels (not cups) for most of my clean ups -welds etc. The trick is to use a high speed reversible drill. With a cup yes works great for a few moments -develops a set and does basically polish. With a drill just run one direction until the bristles start to set and reverse it and like new. I just toggle back and forth as needed. My most used tool in the shop is a 20V -1/4in impact driver with a chuck attachment and an assortment of wire wheel attachments. Over time I can run circles around a cup in a grinder and far more versatile. If someone would invent a reversible grinder for this you would have a real screamer!! I also use a 6in bench grinder wheel with arbour in a 3400rpm 1/2in Makita drill and it really flies and surprisingly runs very smooth. :ugeek: :ugeek:
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Re: Removing mill scale-paint-rust

Postby sedanman » Wed Feb 22, 2017 5:54 am

I've seen wire wheels that have thread on connectors on both sides of the wheel. This allows you to flip the wheel and expose the sharp edge of the wires. I can't seem to find them at the moment.
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