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Thread: Shrinkage -> Hey fiberglass experts

  1. #1
    Tom Brown
    I'm about to make a plug for a piece that needs to fit snuggly over another piece. It's like the lid of a shoebox... at least, around the edges.
    I need it to be pretty accurate (within about 1/8"). The piece is 24 x 15 inches.
    How much shrinkage can I expect using polyester resin? I'd like to know how much to oversize the plug so the final piece will fit decently after the mold and part shrinkage.
    Thanks.

  2. #2
    Nord
    Tom Brown has shrinkage!! :rollside:
    P.M. BadBlown572

  3. #3
    Tom Brown
    bump

  4. #4
    Dave C
    shrinkage jerry, tell them about shrinkage.....

  5. #5
    ratso
    Tom, if you have a plug or mold and let it sit up, there shouldn't really be any shrinkage. You might have some sanding to do for a perfect fit though...

  6. #6
    CandyA$$
    Fiberglass does not shrink. Where did you get that idea?
    If that were true then our boats would fall apart.lol

  7. #7
    CrazyHippy
    Fiberglass does not shrink. Where did you get that idea?
    If that were true then our boats would fall apart.lol
    Your'e kidding right
    BJH

  8. #8
    CandyA$$
    Oh my gosh I am not the blonde. Oh wait I do have blonde in my hair. Oh Oh no I am good.
    LOL!

  9. #9
    Dave C
    but what about in really really cold water? no?
    Fiberglass does not shrink. Where did you get that idea?
    If that were true then our boats would fall apart.lol

  10. #10
    moneypit
    ALL FIBERGLASS SHRINKS. The larger the lay up, the more shrinkage. ( I wrote that... but I read it first)

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