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  • What Underbody Paint?

    I think I've managed to get rid of all the rust that was under the chassis legs and wheel arches on my Old Banger 3B, and given it all a good coat of zinc primer.

    What is the best thing to coat it all with now? Waxoyl? Stone chip paint? Black tractor paint? Hammerite?
    What did Audi use originally? I know it's some sort of flexible stuff that wasn't stuck too well in places.

    I don't want this damn rust to come back again for a while, I've had enough lying upside-down wire brushing, sanding and painting.
    There must be some Ur quattro guys here that know about this sort of thing.
    SS

  • #2
    Did you spray the Zinc primer on Stu ?
    sigpic

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    • #3
      No. I brushed it on.
      SS

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      • #4
        I'll be doing the same then, you can get a hammerite sealer with waxoyl
        sigpic

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        • #5
          you should have used one of these

          http://cgi.ebay.co.uk/SEALEY-SG14-Sc...QQcmdZViewItem
          94 s2 avant
          aoc member 1116

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          • #6
            I prefer the control of a brush. Especially since I've painted the engine bay.
            SS

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            • #7
              This is my area of expertise.
              Stay away from any Hammerite products.

              Undercoat/primer should be POR15. frosts sell it.
              Then 3M bodysealer, comes in a bag, two part epoxy product, very similar to the OE Audi seam sealer. This can be painted body colour as Audis are originally. Then Dinitrol 3125 followed by Dinitrol 4941.
              I am in the restoration business and have seen and used this method for many years. it lasts for ever!
              Rob..
              94 RS2 Noggy,LHD,MTM map,18"cup 1s,245/35/18,Bilsteins,RS2 H&Rs,Cup splitter.
              87 UR 20v ABY
              97 S6 Avant
              96 A6 C4 2.5 TDI quattro avant,Ming,Wietec/eibach,chipped
              1967 Ford Mustang,Eleanor,460ci v8

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              • #8
                This place

                http://www.frost.co.uk/?OVRAW=frosts...WID=1220684031
                sigpic

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                • #9
                  what do you think of the original schutz ive used it for many yrs for sealing new welds without a problem (not the waxoil that never goes off and cant be painted)
                  94 s2 avant
                  aoc member 1116

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                  • #10
                    Originally posted by GT500 View Post
                    This is my area of expertise.
                    Stay away from any Hammerite products.

                    Undercoat/primer should be POR15. frosts sell it.
                    Then 3M bodysealer, comes in a bag, two part epoxy product, very similar to the OE Audi seam sealer. This can be painted body colour as Audis are originally. Then Dinitrol 3125 followed by Dinitrol 4941.
                    I am in the restoration business and have seen and used this method for many years. it lasts for ever!
                    Thanks Rob. I've seen POR 15 Rust Prevention Paint and POR15 Chassis Coat Black. But where do I get that other stuff? It doesn't need to be painted body colour, black is good enough.
                    SS

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                    • #11
                      Originally posted by pastures16 View Post
                      what do you think of the original schutz ive used it for many yrs for sealing new welds without a problem (not the waxoil that never goes off and cant be painted)
                      Rust prevention has moved on alot, new products are much more scientifically tested/designed than the old school schutz type prouducts. The POR15 can be painted on a rusty piece of tube, then when its dry you can hammer it flat and it dosn't chip! if you get it on your skin its like a tatoo! there for weeks!
                      Best tip with POR is to after opening the tin, change to a coffee jar or something with a plastic lid, glass jar. I have not done this at first and the lid gets so sealed on with the paint you have to destroy the lid to get back in! its like its been welded on! Amazing stuff.

                      Most 3M stockists have the sealer, the part number :3M08800
                      , it does need its own gun,not expensive. Lovely finish and super tough.
                      Last edited by GT500; 30 October 2007, 00:23.
                      Rob..
                      94 RS2 Noggy,LHD,MTM map,18"cup 1s,245/35/18,Bilsteins,RS2 H&Rs,Cup splitter.
                      87 UR 20v ABY
                      97 S6 Avant
                      96 A6 C4 2.5 TDI quattro avant,Ming,Wietec/eibach,chipped
                      1967 Ford Mustang,Eleanor,460ci v8

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                      • #12
                        Originally posted by 4WheelDrifter View Post
                        I don't want this damn rust to come back again for a while, I've had enough lying upside-down wire brushing, sanding and painting.
                        There must be some Ur quattro guys here that know about this sort of thing.
                        Mine has been fully waxoiled and undersealed

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                        • #13
                          i used por15 when i repainted my hp2 struts and new wishbones
                          top stuff got it from frost
                          1. SHORT SHIFT KIT
                          2. PORSCHE CAYENNE CALIPERS
                          3. H & R SPRINGS
                          4. BILSTEIN SHOXS
                          5. NEW BUSHES AND HP2 STRUTS
                          6. UPRATED HIGH OUTPUT COIL PACK
                          7. ,3" turbo back s/s/ exhaust
                          8. fmic fitted

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                          • #14
                            Originally posted by amanda View Post
                            Mine has been fully waxoiled and undersealed
                            That translated: the waxoil cheapo goo I had applied has now washed off with the first rain shower. Underseal has now trapped water behind it and is now rotting away nicley!

                            Waxoyl is bobbins and as for underseal, when was the last non rusty MG you saw?
                            Old rubbish.
                            Get it off and get some proper gear on it! especially as its a UR, good rotters!

                            HTH

                            Does that statement apply to the Waxoil that is/was applied to MK2 golfs? Mine still oozes out the rear on a hot day and the car has no rust anywhere? Is this the same stuff you are dissing?

                            Cheers,

                            Steve.
                            Last edited by Fat Audi 80; 5 November 2007, 20:12.
                            Rob..
                            94 RS2 Noggy,LHD,MTM map,18"cup 1s,245/35/18,Bilsteins,RS2 H&Rs,Cup splitter.
                            87 UR 20v ABY
                            97 S6 Avant
                            96 A6 C4 2.5 TDI quattro avant,Ming,Wietec/eibach,chipped
                            1967 Ford Mustang,Eleanor,460ci v8

                            Comment


                            • #15
                              Thanks for the advice.

                              Ah. I remember the good old days of rust proofing, draining the engine oil out of Cortinas, Escorts, etc and then painting the underside of the car with it. I don't fancy that any more. I'm not too keen on using Waxoyl on the old S2 either.

                              Something I can apply without a gun is preferable, as I don't have a compressor and I haven't got much elbow room under the car.
                              I'll definitely give the POR15 a go.
                              SS

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