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    #1

    Undercoating recommendations needed

    Hey everyone,

    Got my subframe reinforced a little while back but unfortunately I scratched some off while replacing the rear diff bolts. Can anyone recommend an undercoating for me? Everyone seems to like the 3m black stuff. Bonus points if the coating is grey. Thanks

    Edit: I dont think I was specific enough in my description. Im looking for a rubberized type of undercoating. Ive circled a photo of stuff similar to what im talking about. Also attached is a photo from my subframe reinforcement. You can see they sprayed it everywhere and it dries to a protective rubberized texture. Thanks!

    Edit 2: I think I found the same product used on my car. 3M 08889. I'm going to order it and will update with how things turn out. And because i'm crazy, i'm going to put some Por 15 underneath the undercoating.

    Additionally, I have a few scratches in my engine bay. the engine bay is matte but touch up dries glossy. Whats the best way to touch up an engine bay scratch?
    Attached Files
    Last edited by SteelGreyM; 09-29-2020, 10:05 AM.
    Tags: None
    #2
    "Undercoating": -if you mean the underside of the body, i went with with Wurth Self Etch Primer Grey and SEM EZ Coat Light Green #62233; this is pretty darn close to our factory color underbody coating. Also used Wurth Brushable Seam Sealer for weld seam areas first. As for engine bay, Maybe BMW has colors available for engine bay.

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      #3
      3m Professional is great stuff. I have a few extra cans in my garage if youre looking for some on the cheap

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        #4
        Originally posted by Rich022 View Post
        "Undercoating": -if you mean the underside of the body, i went with with Wurth Self Etch Primer Grey and SEM EZ Coat Light Green #62233; this is pretty darn close to our factory color underbody coating. Also used Wurth Brushable Seam Sealer for weld seam areas first. As for engine bay, Maybe BMW has colors available for engine bay.
        Hey thanks for the recommendation! That looks pretty close to factory color. Im gonna the spot with a wire wheel first juuuuuust in case some microscopic rust formed in the meantime. Then primer and undercoat. Thank you!

        Edit: This seems to be just the paint. I was looking for a rubberized undercoating to prevent rust.
        Last edited by SteelGreyM; 09-29-2020, 09:42 AM.

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          #5
          Originally posted by Jersey_M3 View Post
          3m Professional is great stuff. I have a few extra cans in my garage if youre looking for some on the cheap
          Hey. Is it the rubberized stuff. What color? Can you link it?

          Comment

            #6
            Originally posted by SteelGreyM View Post

            Hey. Is it the rubberized stuff. What color? Can you link it?
            3M™ Professional Grade Rubberized Undercoating, 03584, 16 oz, 6 per case | 3M United States
            https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Professional-Grade-Rubberized-Undercoating/?N=5002385+3292638249&rt=rud
            3M™ Professional Grade Rubberized Undercoating produces a textured finish which resists chipping, abrasion, exterior rusting and weathering. This coating provides one-coat build-up with no dripping, running or sagging. The undercoating is excellent for automotive undercarriages and for other uses including protection for wheel wells, fenders, quarter panels and more.

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              #7
              Originally posted by Jersey_M3 View Post

              https://www.3m.com/3M/en_US/company-...2638249&rt=rud
              You've gotta be super careful with that stuff. If you trap any moisture underneath it then it will rust faster and worse.Be sure you've properly and extensively prepped the surface before spraying it. If not, it will peel and trap moisture.
              Last edited by SteelGreyM; 09-29-2020, 11:00 AM.

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                #8
                Originally posted by SteelGreyM View Post

                You've gotta be super careful with that stuff. If you trap any moisture underneath it then it will rust faster and worse.Be sure you've properly and extensively prepped the surface before spraying it. If not, it will peel and trap moisture.
                I used 2k epoxy before using it, my Instagram page shows the work done. Jersey_M3

                Comment

                  #9
                  Originally posted by Jersey_M3 View Post

                  I used 2k epoxy before using it, my Instagram page shows the work done. Jersey_M3
                  Great work! Looks like a quality job!

                  Comment

                    #10
                    the Worth Self Etch Primer is color Grey If I forgot to mention the color)

                    The 'rubberized stuff': should be SEM #39793 "HEAVY TEXTURE CHIP GUARD" Opaque. I can't believe all the different paints etc were required when i did my subframe reinforcement 5 yrs ago. BTW all the undercoating sprays, sealers etc. I've used have held up very well.

                    Comment

                      #11
                      If i recall, the order: seam sealer the welds etc, then self etch primer. I THINK I applied the Light Green 62233, and last the Chip Guard. Reddish has a video on this. I followed their recommendation.

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                        #12
                        When I did my RACP replacement 5 years ago, the consensus was to go with WURTH products. I cant recall if this was based on redish motorsport videos or forum member advice. Looking through my pictures, it looks like I used the following:

                        Stone Guard Grey | Underbody | Chemical Product | Wurth USA
                        https://www.wurthusa.com/Chemical-Product/Underbody/Stone-Guard-Grey/p/8890972
                        Stone Guard Spray Description 14 fl. oz. Aerosol - Grey WURTH Stone Guard is a premium quality, paintable surface protectant designed for automotive applications. It forms a hard, textured finish that helps prevent chipping and abrasions caused by stones and debris while inhibiting the development of rust. An easy to use high build, paintable rocker coating that matches OEM textures and provides excellent abrasion and chip protection, sound deadening, and corrosion resistance. Stone Guard is ideal for applications where heavy or coarse texture patterns are desired. Features - Rapid drying - Paintable - Very fine texture - Permanent flexible rubber- plastic coating for use in underbody or rocker panel applications - No messy clean up - Do not -push- dry - For use when coarse texture patterns are desired - High build-up and texture - Industry’s highest rubber content - Allow to dry for a minimum of 30 minutes at 70?F before painting. This product can expose you to Toluene which is known to the State of California to cause birth defects or other reproductive harm. For more information go to: https://www.p65warnings.ca.gov/


                        Brushable Seam Sealer 1-Quart Can | Brushable | Seam Sealer | Adhesive and Bonding | Chemical Product | Wurth USA
                        https://www.wurthusa.com/Chemical-Product/Adhesive-and-Bonding/Seam-Sealer/Brushable/Brushable-Seam-Sealer-1-Quart-Can/p/08901021
                        Brushable Seam Sealer Description 1 qt. Can Brushable Seam Sealer seals cracks, crevices and body seams. It also waterproofs and insulates. Brushable Seam Sealer is flexible; will not crack, shrink, harden or sag and it is paintable in 45 minutes. It is a 100% rubberized seam and joint sealer for bare and printed metals. Excellent adhesion and is ideal for all -lap- and -flange- seams and joints. Permanently flexible. Will not crack and also holds a perfect “brush” mark to match the OEM seam. Will adhere wet or dry and will not -shrink- or -sag-. Features - Seals seams &?joints that are spot welded, riveted or bolted - Seals overlap joints and seams - Brushable, low odor formula - Duplicates OEM appearance - Will not sag or sink - Permanent adhesion to bare or painted surfaces - Temperature range from -13ºF to +176ºF - Grey in color and holds a perfect brushmark - Paintable in 45 minutes - Heavy bodies sealer remains flexible - Adheres wet or dry - Minimal shrinkage Application - Allow at least 45 minutes (at 68?F with 65% Relative Humidity) to dry before painting. - Full cure in 4 - 8 hours This product can expose you to chemicals including Carbon black, Titanium dioxide, which are known to the State of California to cause cancer, and Toluene which is known to the state of California to cause birth defects or other reproductive harm. For more information go to: https://www.p65warnings.ca.gov/


                        Zinc Weld Thru Primer 13.53 Fl Oz | Primers | Chemical Product | Wurth USA
                        https://www.wurthusa.com/Chemical-Product/Primers/Zinc-Weld-Thru-Primer-13-53-Fl-Oz/p/0893109
                        Zinc Rich Weld Through Primer Description 13.53 fl. oz. Aerosol Features - 98 - 99% pure zinc content - Long term cathodic protection for all metallic surfaces - Adheres reliably to all metals - Heat resistant up to 914ºF - DO NOT apply filler after application - Good electrical conductivity - Special epoxy resin for better adhesion This product can expose you to Ethylbenzene which is known to the State of California to cause cancer. For more information go to: https://www.p65warnings.ca.gov/


                        pricey but this is the part where You don't want to cut corners.... last thing you want is rust down there
                        2005 Phoenix Yellow M3 Coupe 6spd
                        2013 Interlagos Blue M3 Coupe 6spd ZCP, CF roof
                        2007 Imola Red Z4M Coupe

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                          #13
                          Originally posted by Jersey_M3 View Post

                          I used 2k epoxy before using it, my Instagram page shows the work done. Jersey_M3
                          What'd you use for the primer? It looks like it matches the OE stuff pretty well

                          Comment

                            #14
                            3M Rocker Panel Coating, 08889, Gray, 23 oz Net Wt (650 g) https://www.amazon.com/dp/B000L9VXHE...ing=UTF8&psc=1

                            Btw guys I ended up buying this stuff. Matches very closely and looks great. High quality stuff. I can recommend it.

                            Comment

                              #15
                              Originally posted by mscott7426 View Post

                              What'd you use for the primer? It looks like it matches the OE stuff pretty well
                              It’s not the right color but it appears to be a great product. From Amazon:
                              1 of SprayMax, 2K Epoxy Rust-Cure Primer, Gray, Aerosol (1)
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