man over board,jus kidding, plastic help

Discussion in 'Fiberglass and Composite Boat Building' started by the1much, Oct 9, 2007.

  1. the1much
    Joined: Jul 2007
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    the1much hippie dreams

    hey peoples, i know ya cant use fiberglass for fixing plastic (tried to many times heh) but i have a meter that goes on a big tank, its kinda boxed shape, its made outta hard , thick ( 1/2"), and someone (me) broke a piece off it. i've tried resin and cabasil, even tried that TPO epoxy for plastic bumpers :confused:
    so now im trying you guyz. man i hate it when i cant glass things! oh, i even tried that bad word(bondo) stuff.
     
  2. charmc
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    charmc Senior Member

  3. the1much
    Joined: Jul 2007
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    the1much hippie dreams

    im also missing a piece about an inch in a spot too
     
  4. charmc
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    charmc Senior Member

    Believe it or not, go to ebay.com, search the terms plastic pieces, nearly 300 items, take your pick. :) :)
     
  5. the1much
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    the1much hippie dreams

    thanks man :)
     
  6. the1much
    Joined: Jul 2007
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    the1much hippie dreams

    heres pics, the piece missing is a half inch chunk from that missing ear, i have the end and 1 side, its just missing 1 side piece. if noone understands me i can get that other piece in the pic too,,well maybe i can heh,,Ty alls
     

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  7. charmc
    Joined: Jan 2007
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    charmc Senior Member

    Ahhh! A stress-bearing part.

    Plastic welding might work, and you could build up the mising area with "weld rod", similar to the way metal welders do. To get back to original strength, however, you'll need to know exactly which of the many plastics was actually used to make the original part.

    Here's another suggestion, if cosmetics are not as important as function. You can use the other lug to make a template, then cut 2 pieces of metal (aluminum or light guage SS) and drill the top hole to match. Drill 2 smaller holes through the lower end of the metal pieces and the base of the broken lug, then through bolt the metal to either side of the broken lug. If necessary or desired, use a piece of hard rubber, plastic, or something similar as a spacer between the 2 metal pieces above the broken off lug base. Definitely not pretty, but it should get the job done.
     
  8. oops!
    Joined: Oct 2007
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    oops! Junior Member

    Meythil chloride
    ava at industrial plastics and paint.
    will weld it instantaly and permanantly
     
  9. the1much
    Joined: Jul 2007
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    the1much hippie dreams

    Thanks charmc and oops,,oops, is that suff for a "plastic welder,, or goop ta spread on?,,,,,,,and TY again guys
     
  10. Fanie
    Joined: Oct 2007
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    Fanie Fanie

    As Charlie suggested you could maybe grind the broken piece off and replace it altogether with a machined part you screw into it's place - it could even be stainless. Ultrasonic welding works well but if the part broke in the first place either the material has deterrred and is becomming brittle or the ear is a bad design from the start.

    For the hole you could make a cap out of suitable material that will cover the hole and use a rubber for polly foam as a sealing gasket with screws all around. You get foams that won't dissolve in fuel. Nupreen rubber will work but in my experience doesn't last long if exposed to UV ie from the sun.
     
  11. oops!
    Joined: Oct 2007
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    oops! Junior Member

    methyl chyloride is a watery stuff like crazy glue
    but just a bit different!!!!
    it is applied with a needle like pin attached to a small bottle.
    it will instantly weld the plastic parts togeather.
    they actually melt togeather.
    less is more. used primarily on lexxan or plexi glass. the stuff is strong!
    make sure surfaces are clean. (acetone.)
    then just one small drop on each side. hold peces togeather, u dont need clamps. and 10 secs later , done!
    in canada the store is called industrial plastics and paint.
    i dont know what the us counterpart is called. but any place that sells plexi glass will carry it.
    methyl cloride is cheep! i allways have a small container handy. youll end up using it for lots of stuff!
    cheers!
     

  12. the1much
    Joined: Jul 2007
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    Location: maine

    the1much hippie dreams

    Thanks guys :) today and tomorrow i got paintin ta do, then im trying that fancy werd stuff heh then if that dont work i guess im left making a cast for it(too bad i didnt charge as much as a doc.) i appreciate the responses :)
     
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