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Paint and Bodywork forum Around here sheetmetal is optional but if you are going to do it, do it right.

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Old March 18th, 2017, 19:59
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montanaman montanaman is offline
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Prepping new steel for welding and painting ...

Hi guys ... I don't know much about painting, so I thought I'd ask :

New steel usually comes with a gray coating, which I guess is there to prevent rust. Not sure what it is, but should it be painted? Or should I strip it off before painting?

If it needs to be stripped, how do you do it? Chemicals, flapper wheel, or some other method?

Thanks.
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Old March 18th, 2017, 20:09
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Re: Prepping new steel for welding and painting ...

As far as I understand you can use aircraft paint thinner/stripper to get it off
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Old March 19th, 2017, 07:04
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Re: Prepping new steel for welding and painting ...

What kind of steel, and for what kind of project ? Cold rolled steel, which includes sheet metal, should only need solvent cleaning and scuffing before primer. Hot rolled steel tube or steel plate will give the best results if the mill scale is ground or sandblasted off. Solvents will have no effect upon mill scale.
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Last edited by Tim_MN; March 19th, 2017 at 07:11.
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Old March 19th, 2017, 10:07
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Re: Prepping new steel for welding and painting ...

Thanks for the replies. Yeah, the magic words were "mill scale." I didn't know it was called that. Its the dark gray stuff on plates of mild steel. It's just ordinary steel that I bought from the local steel provider (Pacific Steel). I bought it for various projects, but right now I'm making a little mounting plate for an in-line fuse for my alternator upgrade. Tons of videos on YouTube for removing it with hydrochloric (muriatic) acid, sand-blasting, etc.

Thanks!

Last edited by montanaman; March 19th, 2017 at 10:39.
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