Scotch-Brite Clean and Strip XT Pro Disc - Rust and Paint Stripping Disc - 4.5” diam. x 5/8-11 Quick Change Thread - Extra Coarse Silicon Carbide - Pack of 1

Be careful here.3m part number 29900 is not silicon carbide,it’s aluminum oxide.

These work better than anything else Ive found to remove mill scale from steel.

Excellent product. Cant beat the value and quality of this product. Does what its advertised to do and then some. Dont press on the pad, let the pad and your grinder do the work. Applying pressure just pre materially wears you and the pad out. Great product.

These disks are very good at removing the paint and leaving the metal below in good condition

Crazy effective for removing mill scale. Concerned about longevity. We shall see.

Had a project I was working on over a year. By the time I completed it there was some rust on my welds as well as the steel plate, with this I was able to quickly remove all rust and get it down to a level I could paint without leaving any deep scratch marks.

Gets the job done - and quickly !

Works really well, but unfortunately only for a couple square feet.

I used this to remove *heavy* mill scale from all the surfaces of a 10” piece of W8x40 I-beam. It took probably 65% of the disc to do it but it did an outstanding job. 3M states it’s only for light mill scale; mill scale doesn’t come much heavier than what I used it on. And no danger of cutting into the good steel or dishing it.

Works great while they last, but they are very expensive given how long they last. Mostly I tested them byt removing paint and/or rust from a small amount of mild steel tubing, plate and bars.