Surface rust removal
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Thread: Surface rust removal

  1. #1
    Tadpole Hatstand40's Avatar
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    Default Surface rust removal

    Hi there, have a 1954 Renault 750 with extensive surface rust, planning on using a chemical removal system, any advice or previous experience to share? Cheers Dave S

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  2. #2
    Fellow Frogger
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    If you are a very patient restorer, the Deox-C gel sold locally by the POR importers does work, but it's quite slow. You must cover it with plastic film so it won't dry out and will need to wash it off and scrub with a brush. It is effective, does not cause distortion and will leave a chemically clean surface, but it is expensive and a slow way to proceed. It works in a similar way to molasses. It would probably help to mechanically remove as much rust as you can with the strip-it discs that fit a grinder. You can buy them at Bunnings (and elsewhere) and they look like a hard foam matrix pad. It's a dusty/messy job. Otherwise, you have various bath processes and the commercial stripping solutions.

  3. #3
    1000+ Posts robmac's Avatar
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    http://www.solvents.net.au/index_htm...20(169370).pdf

    Apply liberally and clean off rust with steel wool.

    Wash with prepsol.

    Then apply an etch primer.

    Then apply an undercoat compatible with top coat.
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    Tadpole Hatstand40's Avatar
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    Thanks, I'm planning to use a small grinder and flap discs to start with, then chemically strip it. Plenty of time for this.

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  5. #5
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by Hatstand40 View Post
    Thanks, I'm planning to use a small grinder and flap discs to start with, then chemically strip it. Plenty of time for this.

    Sent from my E6883 using aussiefrogs mobile app
    By the time you have finished with the mechanical cleaning.

    The car will be beginning to rust again. Unless you paint as you go.
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  6. #6
    Fellow Frogger
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    Deoxidine is an excellent product and like many others I've used it in the past, but be aware it is phosphoric acid based and some epoxy primers are apparently unhappy about being applied over surfaces treated in that way. Similarly, some undercoats are no happy with etch primers, so dig into your preferred paint system's requirements before you leap.
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  7. #7
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by David S View Post
    Deoxidine is an excellent product and like many others I've used it in the past, but be aware it is phosphoric acid based and some epoxy primers are apparently unhappy about being applied over surfaces treated in that way. Similarly, some undercoats are no happy with etch primers, so dig into your preferred paint system's requirements before you leap.
    http://www.protec.com.au/images/uplo...s_29-11-16.pdf

    This etch accepts 2pack or acrylic primers over the top.
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    1000+ Posts driven's Avatar
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    What is the corrosion in the sub structure like?

    This may be more critical than panels
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  9. #9
    Tadpole Hatstand40's Avatar
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    Floors are all solid, have factory pattern repair sections for the A pillars and passenger side sill/floor.

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  10. #10
    1000+ Posts robmac's Avatar
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    Looking at candidate in your avatar.

    I'm wondering if garnet blasting may be a better option.

    It's fast and you get the boring work out of the way quickly and have a "clean slate" to start work with.
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  11. #11
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by Hatstand40 View Post
    Floors are all solid, have factory pattern repair sections for the A pillars and passenger side sill/floor.

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    FWIW, when we finally had ours painted for her 65th birthday, we had it masked up and soda blasted. Very satisfactory. I didn't attempt it myself. There wasn't much rust (I know of some that was stabilised years ago with fishoil and have no plans to do more) but a lot of work was needed to smooth out 65 years of odd little bangs and scrapes before shiny paint was applied! Mine has two-pack but with lots of flattener so it isn't too glossy for my taste.
    Attached Thumbnails Attached Thumbnails Surface rust removal-stripped-metal-1.jpg   Surface rust removal-starting-preparation-11-nov-2015.jpg   Surface rust removal-4cv-new-frock-dec-2015.jpg  
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    JohnW

    Renault 4CV 1951
    Renault R8 1965
    Renault Scenic 2005 (wife's)
    Renault Scenic 2007 (mine)
    Renault Scenic 2006 (daughter's)
    CitroŽn CX Pallas 1980

    National Co-ordinator, Renault 4CV Register of Australia

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    Tadpole Hatstand40's Avatar
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    Thanks for all the feedback and suggestions, I'll be thinking hard about what to do in the next year.

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