Powdercoating necessary?

Discussion in 'Anything DIY Related' started by Jaco Schoeman, 11 May 2010.

  1. Jaco Schoeman

    Jaco Schoeman MASA Contributor

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    Hi all you metal experts...

    If one builds a stand from something like squere tubing, is it a must to powdercoat it. From what I understand, and know, NO metal on earth will not eventually rust.

    My question is, if you just give it a couple of layers of anti-rust, then respray over it, would that be sufficient?

    I know, that the moment you get a scratch, no matter what you treated with, you will get rust.

    Your thoughts please...
     
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  3. Evo R

    Evo R

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    Why not Galvanize? Its alot cheaper than powdercoating.
     
  4. leslie hempel

    leslie hempel Moderator MASA Contributor

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    no exposure of metal = no rust. as for galvanising you need to remember that the galvanising ai a sacrificial coating aimed at corroding before the steel it is bonded to does.. i would also advise painting a galvanised stand.. to prolong the protective coating..
     
  5. Pads

    Pads

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    I'm not certain on the statement 'all metal will eventually rust' but some metals that do not. Gold, Platinum, Iridium, Lead, Mercury, Nickel.

    An true if you scratch away the powder coat you'll get rust developing on that area. Galvanising is a good option but what has to be assessed is the structural weakening by drilling all the holes to allow the fluid to coat the internal and external surfaces. Is it really a factor or not?
     
  6. RiaanP

    RiaanP Moderator

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    For the effort, either powdercoating or galvanize is cheaper taking time and paint into account.

    Powdercoat is also cheap. And frame is not heated that much compared to galvanize. Less change the operator will bent your frame when they drop it. Just ask Schaun

    And you can choose different colours, red, yellow, grey, blue, black....

    On all the options you still have one problem. You can not drill or weld the frame after the deed is done. Although with paint you can touch it up the easiest.

    Other thing with galvanize, because you use square tubing, you must ensure that the air inside can escape, else your frame will explode (well sort of)
     
  7. RiaanP

    RiaanP Moderator

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  8. Jaco Schoeman

    Jaco Schoeman Thread Starter MASA Contributor

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    Okey, but after all of this, what different is powedercoating then to normal "anti-rust" and a good quality metal paint - for much less cost?

    How much longer would a powdercoated stand last compared to painted one?
     
  9. robertkukla

    robertkukla

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  10. ziyaadb

    ziyaadb

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    Hammerite (http://www.hammerite.com/global/products/index.html) is a good option for an anti rust paint i used almost 1 litre on my stand. they say it should last about 8 years as thats the guarantee they give if i get 5 i will be happy feels like a strong rubber once applied. I bought it from Builders at 269.99
     
  11. Jaak

    Jaak

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    Tagging along...
     
  12. RiaanP

    RiaanP Moderator

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    Well when I done my stand in powder coat it cost me R400. They sandblast it first and then powdercoat it.
    And Hammerite at R270 for 1L and then I still have to paint it. Also first ensure that it is rust free. And i doubt if 1L would have been enough for my stand.

    And then the time to paint and cost to cleanup.

    Check out post 37
    http://www.marineaquariumsa.com/showthread.php?t=14665&page=2

    So it is cheaper in my opinion to sandblast compared to painting it yourself.
     
  13. Pads

    Pads

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    Don't we all, people would come only to look at the stand, tank is merely superficial. :lol:
     
  14. leslie hempel

    leslie hempel Moderator MASA Contributor

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    riaanp when you hve a stand powder coated is it just the expertior they coat ir is it a simular practice (dipping) as in galvanising where holes re drilled to allow the inners of the tube to be coated aswell? curious
     
  15. Jaak

    Jaak

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    As far as I understand it's just the exterior and they try to spray into the square tubing as deep as possible.
     
  16. RiaanP

    RiaanP Moderator

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    There is no holes. All welded up on the 50mm square tubing.

    What is well open is the 19mm subframe that supports the sump. Its ends are open. But you can always use those plastic end caps. Or use press stick to end that off.

    Anyway same problem when you paint it.
     
  17. leslie hempel

    leslie hempel Moderator MASA Contributor

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    cool, thank you fr the clarification... its the contact of the atmosphere with the steel thats the problem as oxidation is what causes rust.. so limiting this is where you can preserve the steel surface longer.. when i did my stand i used a wasteful method of flooding the inside of the steel with a primer and then a topcoat..

    im pretty confident it coated everything but you can never be sure..
     
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