Prepping big steel pieces for paint
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Prepping big steel pieces for paint

This is a discussion on Prepping big steel pieces for paint within the Technical forums, part of the Caferacer.net Forums category; I picked up some 2"x3" 11ga mild steel rectangular tubing for my frame jig. I paid $75 for a total of 15 feet, so I ...

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Thread: Prepping big steel pieces for paint

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    Senior Member Tanshanomi's Avatar
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    Prepping big steel pieces for paint

    I picked up some 2"x3" 11ga mild steel rectangular tubing for my frame jig. I paid $75 for a total of 15 feet, so I am assuming these are hot-rolled.

    They're pretty grungy and handling them turns my hands black pretty quickly. Since I have a week to wait until I get the rest of the jig fittings, I'm thinking of giving these a coat of paint in the meantime. Given their size and intended use, I'd like to brush apply rather than rattle-can it. I'll probably use some generic hardware store tractor enamel over red oxide primer.

    What is the proper prep prior to paint? It is enough to just wipe them down with mineral spirits, or do I need to get more involved and strip/etch/sand the surfaces somehow?
    Any guidance would be appreciated.

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    Last edited by Tanshanomi; 10-09-2017 at 08:47 AM.

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    Senior Member nic579's Avatar
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    Good start I would probably finish up with some coarse abrasive pads than lacquer thinner just before the primer/paint.

    I would do all your fab and welding prior to painting however.
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    Senior Member Tanshanomi's Avatar
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    Quote Originally Posted by nic579 View Post
    Good start I would probably finish up with some coarse abrasive pads than lacquer thinner just before the primer/paint.

    I would do all your fab and welding prior to painting however.
    Okay, thanks. There’s no welding required, I ordered Chop Source’s bolt-together jig kit.

    Last edited by Tanshanomi; 10-09-2017 at 10:21 AM. Reason: Added photo.

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    Senior Member Teazer's Avatar
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    I have that same jig and it works really well for what I need. Mine is bare steel. I wiped the tubes down with WD40 or something similar and left it that way.
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    Senior Member unclerob's Avatar
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    I make quite a few jigs using hot rolled tube and it only needs the mill scale grinding off if you're going to weld, otherwise just a couple of goes over with thinners and abrasive pads....then a coat or 2 of Rustoleum Combi Colour put on with a roller which adheres really well without primer....
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    Senior Member Diamondj's Avatar
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    Quote Originally Posted by Tanshanomi View Post
    Okay, thanks. There’s no welding required, I ordered Chop Source’s bolt-together jig kit.
    Bolt together? Details please?

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    jcw
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    That dark scale is protective somewhat. If you remove it with abrasive (which you would have to do before welding) then the bare metal rusts much faster.

    But if you are going through the trouble of painting it, wipe it with a bunch of paper towels and acetone (or whatever as long as you aren't welding it right after) to clean the oil off. It takes a lot of paper.

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    Senior Member Tanshanomi's Avatar
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    Quote Originally Posted by Diamondj View Post
    Bolt together? Details please?
    See the photo I posted a couple of replies back in this thread.
    Here's the link to their site:
    http://www.chopsource.com/frame-jigs.html

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    Senior Member Tanshanomi's Avatar
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    Quote Originally Posted by unclerob View Post
    I make quite a few jigs using hot rolled tube and it only needs the mill scale grinding off if you're going to weld, otherwise just a couple of goes over with thinners and abrasive pads....then a coat or 2 of Rustoleum Combi Colour put on with a roller which adheres really well without primer....
    I went looking for Combicolor and I did find it, but it doesn't look like it's widely available on the U.S. market, and it's really expensive. I ordered a quart of regular Rustoleum oil-based enamel for 1/10th the price.

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    Senior Member hillsy's Avatar
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    Quote Originally Posted by Teazer View Post
    I have that same jig and it works really well for what I need. Mine is bare steel. I wiped the tubes down with WD40 or something similar and left it that way.
    For a jig application, this is the way to go ^^^

    You will need to move the tubing in and out of the clamps to adjust for different frame geometries and paint on the tubes will either hamper this or get scraped off.

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