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Thread: body filler and plastics..

  1. #1
    Newbie
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    body filler and plastics..

    So please someone explain to me, I see all this great fabrication and in my attempts the body filler im using (rage gold) seems to come apart from the plastic (abs) when the car gets warm. I'm so frusterated..

  2. #2
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    before you apply it to plastic do you rough up the plastic first to give the rage something to grab onto? Do you throughly clean the surface before applying the rage?

    do you have pictures of what you are tying to do?

    if we can see pics of the surface, etc we can help with some pointers on how to work with it!
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  3. #3
    FLAC evandude's Avatar
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    You might have to apply something between the plastic and filler. I would suggest looking into adhesion promoters, they are intended to allow paint and fillers to properly adhere to plastics where they otherwise wouldn't.

    Also, depending on what you're trying to do, you might want to use something else as a structural material and only use the body filler for smoothing things out.

    And, if you're working with an ABS plastic, then you might want to look into the ABS sludge method... that can give you a good, structural bond as well as act as the filler, leaving you with a finished piece that's all ABS, and nearly as strong as if it was molded that way in the first place. and of course, with it all the same material, there are no more troubles with materials expanding differently with temperature, and separating.
    But don't take it from me! here's a quote from a real, live newbie:
    Quote Originally Posted by Viscouse
    I am learning buttloads just by searching on this forum. I've learned 2 big things so far: 1-it's been done before, and 2-if it hasn't, there is a way to do it.
    eegeek.net

  4. #4
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    i've tried the abs sludge material with bad results. even after a week of curing it never hardened.

    I do rough up the abs with 80grit and it seems to be at the edge. I haven't tried an adhesive promoter though, I do have some, I'll test it out and get back to you.

  5. #5
    Low Bitrate
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    Quote Originally Posted by phreak9i6
    i've tried the abs sludge material with bad results. even after a week of curing it never hardened.

    I do rough up the abs with 80grit and it seems to be at the edge. I haven't tried an adhesive promoter though, I do have some, I'll test it out and get back to you.
    If you want to stick with plastic for your fabrication, you can try something like SEM 39768 Problem Plastic Repair Material. This is similar to Dynatron (Bondo) Flexible Bumper Repair Kit. The SEM stuff will give you an exceptional bond. It's more expensive than making your own ABS sludge...about $40. And, it may harden faster than what you're looking for depending on your application. You can generally sand this stuff within 2-5 minutes after application. I felt that it setup a bit too fast for what I was trying to do with several inside corners and tight spaces. For a large flat piece or a simple piece that you can sand easily, I think this stuff would be great.

    Guess it depends on what you're trying to do. So, like Red said...post pics or give us some detail on what you're trying to do and we can help you more effectively.

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