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Thread: How to treat media blasted steel

Discuss the Austin Healey Sprite and the MG Midget. Two different but similar cars sometimes referred to collectively as the Spridget.

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    Senior Member JimLaney's Avatar
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    How to treat media blasted steel

    Cleaned my engine back plate with media blaster to remove surface rust. I want to mount it on the assembled block and paint it but I don't want flash rust so I coated it with light oil. Is there a standard method to dealing with the problem of flash rust after cleanup?
    Jim Laney
    2 MKIII Sprites - in process
    2013 Kawasaki Ninja 650
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    past: BE, MkII, AH 3000

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    Darth Vader Rut's Avatar
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    Re: How to treat media blasted steel

    Jim,
    After you degrease the back plate you can spray it with a phosphoric acid based metal preservative like Ospho. Rustoleum makes one that I buy at the big box stores that you can dilute with water, spray it on and let it dry...does a very good job.
    Rut
    Rut, '60 Bugeye, '70 MGB, '62 TR4, '66 TR4a IRS, '67 TR4a IRS, '68 TR4a IRS, '72 TR6

    When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life. John Lennon


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    Great Pumpkin JPSmit's Avatar
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    Re: How to treat media blasted steel

    even WD40 has a shellac in it
    John-Peter Smit
    1976 MG Midget
    1969 Vauxhall Viva GT
    1958 Fiat Multipla (Barn art)

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    Obi Wan Sarastro's Avatar
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    Re: How to treat media blasted steel

    If you're going to paint it, you really don't want to put oil or such things on it. You can give it a coat of primer and paint it at your leisure. If it's something you plan to weld, you can use weld-through primer.

    I'm currently restoring my engine, and I'm painting parts as I go. I use media blasting only as a last resort, as it creates quite a mess and can leave abrasive where you really don't want it. For flat items, a wire wheel on an angle grinder is great.
    Steve Maas
    1966 Triumph TR4A, undergoing restoration: http://www.nonlintec.com/tr4a
    1952 MG TD, restoration completed 2014, sold 2016: http://www.nonlintec.com/mgtd
    1960 Austin-Healey "Bugeye" Sprite, sold 2010: http://www.nonlintec.com/sprite
    1967 Porsche 912: http://www.nonlintec.com/porsche

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