Need advice on cleaning steel prior to priming and painting.
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Thread: Need advice on cleaning steel prior to priming and painting.

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    green and red man's Avatar
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    Need advice on cleaning steel prior to priming and painting.

    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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    RRMCCABE's Avatar
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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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    cmoore's Avatar
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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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    green and red man's Avatar
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    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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    Captain Hook Kennyd's Avatar
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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.
    Kenny

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    mjncad's Avatar
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    Mineral spirits or naphtha or lacquer thinner after I wire brush the crap out of it. I prefer naphtha over mineral spirits as it's not oily.
    I have more ideas than ambition.


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    green and red man's Avatar
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    Quote Originally Posted by Kennyd View Post
    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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    Captain Hook Kennyd's Avatar
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    Quote Originally Posted by green and red man View Post
    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!
    Kenny

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    Scotty370's Avatar
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    Ditto Kenny..........

    Quote Originally Posted by Kennyd View Post
    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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    green and red man's Avatar
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    Quote Originally Posted by Kennyd View Post
    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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