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Thread: Help - problem with SEM bumper repair

  1. #1
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    Unhappy Help - problem fabricating bezel with SEM bumper repair

    Is the Dynatron bumper repair product better than the SEM version? I ask because I just got most of the way through fabricating a Lilliput bezel into a flat sheet of 1/8" ABS and had one of the seams separate after the SEM bumper repair had cured for > 24 hours. Then with only a minor amount of force, I was able to pop out the entire bezel from the opening in the ABS. It seemed to separate from the ABS sheet just as easily as from the Lilliput bezel. I had sanded the bezel down to the raw plastic and had filed the edges of the ABS as well. I should have guessed there would be problems when the cured material flaked off of the surface of the ABS fairly easily while sanding.

    Can I expect better results from the Dynatron? Also, is there a product that has a little more working time than the SEM? It seems like I only get around 3 minutes before it has set up enough so that it won't flow into seams anymore.

    If not, it sounds like the dissolved ABS will do a better job assuming a thick enough solution.

  2. #2
    MySQL Error MatrixPC's Avatar
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    You should NEVER use filler material as an adhensive.
    By that I mean, you should epoxy the Lillipt and the bezel before using SEM bumper repair. That is how I did it and didn't have any problem.
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  3. #3
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    the sem product is more of a filler... it is soft & easy to sand, but not really good enough to bond the bezel to the panel...the adheasion isn't that hot with the sem also.... dynatron is closer to an epoxy of sort & will do the job a lot better, still wouldn't be a bad idea to weld it first... or plastic epoxy...., but the dynatron stuff is pretty strong all by itself.. it should do the job......

  4. #4
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    Thanks for the advice. I had thought the SEM product was equivalent to the Dynatron, but now I know. And I had thought it was good enough to work as an adhesive as well based on turbocad6's post (#247) in the "Solvent adhesives..." thread. There is a quote there "use this stuff as glue to final position bezel" referring to the Dynatron bumper repair kit that led my to my original plan.

    So I'll try to find the Dynatron bumper repair tomorrow (or 3m or equivalent).

    With the SEM bumper repair, I ended up with a few small pinholes that I was in the process of filling when I ran into trouble. Will I likely experience the same with the Dynatron? If so, can I fix them with just the bumper repair product, or should I look into a spot putty? Any brand recommendations for that?

    Thnaks again for the help.

  5. #5
    MySQL Error MatrixPC's Avatar
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    You are more likely to run into pinholes. I use bondo brand (lazy to find something else) spot putty, and it works fine.
    When you apply filler product, try to use a razor to smooth it out to reduce pinholes and less sanding.
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  6. #6
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    Quote Originally Posted by MatrixPC
    You are more likely to run into pinholes. I use bondo brand (lazy to find something else) spot putty, and it works fine.
    When you apply filler product, try to use a razor to smooth it out to reduce pinholes and less sanding.
    Just be aware that spot putties (the kind without a cream hardner) will shrink and can potentially cause cracking around where it has been applied. Usually if you use it in small area's, for instance, just to fill pinholes, you're fine. Just don't get to crazy with it. That's what the regular fillers are for.
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  7. #7
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    So after calling around to every auto body supply store that I could find and nobody carries the Dynatron Flexible Bumper Repair kit or the 3M product. However I did find some Transtar Plasto-Mend Plastic Repair (Flexible). It looks similar to the Dynatron and claims the following:

    Plasto-Mend plastic repair is an epoxy material designed for cosmetic repairs of flexible to rigid parts such as ABS, TPO and Polyurethane. Provides maximum adhesion and superior featheredge sanding qualities.

    It claims it can be sanded in 15 minutes.

    Anybody have any experience with this product?

  8. #8
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    no clue..... "epoxy material" sounds promissing..... "designed for cosmetic repairs" might indicate low structural strength though.... ?????????????

  9. #9
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    Does anyone know if there is somewhere online where you can buy the dynatron stuff?
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  10. #10
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    Quote Originally Posted by Miles
    Does anyone know if there is somewhere online where you can buy the dynatron stuff?
    Nevermind - thank you ebay
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