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Discussion Starter #1
I had to purchase some square steel tubing today to finish a project. It's 2"X2" 11 gauge tubing. The place I was going to purchase it from sells the tubing already primed with red oxide primer, but they no longer sell the 11 gauge square tubing. So, I had to buy from a metal building manufacturer and all they have is oiled steel tubing.

How do I properly prepare this oily steel before priming and painting? I'll have to cut and weld it before priming of course. Brake cleaner spray?

What you guys say?
 

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I always use mineral spirits to start with. Then do my welding, run a DA over it with 40 grit and then use something like metal prep cleaner.
 

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I usually sand blast my smaller metal that i can fit in my cabinet blaster then prime it, then paint it. That is the best way that I Had the best luck with.
 
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Discussion Starter #4
Thanks guys. If the blast cabinet was larger I'd definitely put the pieces in to blast. Some of the pieces are going to be 4 feet or longer.
I really do like the way blasting leaves the surface on steel.

One of these days I hope to invest in a large capacity, portable soda blaster.
 

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Mineral spirits or lacquer thinner for me...then follow up in the blast cabinet if it fits-if not then usually a wire cup brush in the angle grinder.
 
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Discussion Starter #7
Mineral spirits or lacquer thinner for me...then follow up in the blast cabinet if it fits-if not then usually a wire cup brush in the angle grinder.
Do you use a knotted wire brush or the crimped style? All I've been using are the knotted style brushes.

Thanks
 

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Do you use a knotted wire brush or the crimped style? All I've been using are the knotted style brushes.

Thanks
Crimped for me...dunno know why but that is all I have treid. Try to wear a heavy jacket though since the wires WILL fly out and stick in you shirt!
 

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Ditto Kenny..........

Crimped for me...dunno know why but that is all I have treid. Try to wear a heavy jacket though since the wires WILL fly out and stick in you shirt!
........They will aso stick in your skin very nicely!! And, even through jeans! Did I mention eye protection? Full-Face welding helmet profered......... ~Scotty
 

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Discussion Starter #10
Crimped for me...dunno know why but that is all I have treid. Try to wear a heavy jacket though since the wires WILL fly out and stick in you shirt!
Thanks, that's good advice for sure. I have an old crimped wire wheel that's attached to an electric motor. Used to belong to an elderly friend who had a repair shop. The wire wheel is approximately 10 inches in diameter. I found out what those pieces of steel feel like when they penetrate my jeans. Ouch!!

Mostly I use the angle grinder with the cup brushes. Will be glad when I can afford a larger blast cabinet and of course a larger air compressor too.
 

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I havent used a wire brush since I found 3M clean and strip wheels. Run them in my die grinder. Probably faster than I should but they do a really nice prep and dont burnish the metal like wire wheels.
 

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Discussion Starter #12
I havent used a wire brush since I found 3M clean and strip wheels. Run them in my die grinder. Probably faster than I should but they do a really nice prep and dont burnish the metal like wire wheels.
That's a good idea too. Yeah, I didn't like the way the knotted wheels burnished the tractor wheels I stripped before.

I need to buy a new die grinder.
 
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