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Thread: KURUST & Etch Priming

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    Pit Crew Decade Plus User MK1_Oz's Avatar

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    KURUST & Etch Priming

    Thanks to Dave I have imported and become addicted to KURUST!!!! I love my fingers purple...it sets off my eyes so well .

    How long do people leave the KURUST for before etch priming? I am working my way through removing the rubbish black primer off all my replacement panels but want to etch prime them in one go. It may be a week until all panels are stripped and KURUSTed. Is a week too long to leave treated metal before painting? Should I perhaps give another coat of purple nectar before painting?

    On that note, I am not all that happy about painting over this product. I was thinking of stripping it ALL off then immediately etch priming (I am using Wattyl Super Etch but that is probably an Aussie only brand). My theory is that once the product has done its job ie converted oxide to something else, then its job is done and it does nothing else. It is a converter not an active preventative product??

    On another related note, etch primer, I am told, goes on as a light coat. After sand blasting my car was painted in black etch primer but it is thick enough so that I cannot see metal through it (it's tough as nails too!!!). How thick is thick enough????

    What's ya thoughts?
    Last edited by MK1_Oz; 17-03-2010 at 10:06.
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    Re: KURUST & Etch Priming

    Use a thinners soaked rag to "wash" the black primer off the new panels. Messy, but by far the easiest way.
    If there were no scratches in that black primer and therefore no rust, you shouldn't need the Kurust on them.
    If you do use it wipe it on with a piece of cloth rather than brush it on. Leave overnight to dry.
    Quick rub down with a bit of sandpaper or whatever and etch prime. Etch prime is normally not much more than a dust coat before the filler primer.
    If the panels are likely to be sat around for ages a little bit more etch primer when you do it.
    If it is red hot and dry over there it should be OK. Over here you can pretty much reckon it will be wet, so panels dissolve before your eyes.

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    Re: KURUST & Etch Priming

    If you've had the car sand blasted and etched you shouldn't need Kurust just give a scuff and you should be able to spray filler primer over it. I would strip the black primer of the panels and only use Kurust if you've had a bad case of surface rust, otherwise like dave said if its goin to be a while till you paint it give it a good coat of etch and it will be fine.

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    Re: KURUST & Etch Priming

    Had this reply from Hammerite regarding KURUST;

    The Hammerite Kurust aswell as converting rust is also a primer, so does not require an etching primer over the top. The adhesion of the metal finish over the top should be very good.

    Although not the normal recommendation (if possible) you could remove the converted areas and then prime and coat the surface itself.


    The bottle makes no mention of it being a primer........
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    Re: KURUST & Etch Priming

    IIRC it says on the bottle it can be painted over. Like a primer can be.

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    Re: KURUST & Etch Priming

    It does say that...
    • prim·er [prahy-mer] –noun

      a first coat or layer of paint, size, etc., given to any surface as a base, sealer, or the like.

    May not state "Primer" on the bottle but I guess it meets the definition!!!!!!!!!!!!!!
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    Re: KURUST & Etch Priming

    good grief! that's the first time i've heard a mechanic refer to a dictionarial definition
    I'm going to pull your head off because i don't like your head!

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