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Thread: Fiberglass droop & summer heat

  1. #1

    Fiberglass droop & summer heat

    I have seen references that some kits (usually the front end) "droop" after being in the sun too long. Is this just because those particular kits have unsupported structures or is it the materials/technique they use? Corvettes don't have this problem, right?

  2. #2
    Senior Member BondoBob's Avatar
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    Re:Fiberglass droop & summer heat

    I have never heard of anything like that.What sorse told you that?

  3. #3
    Moderator FunnyWheels's Avatar
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    Re:Fiberglass droop & summer heat

    I had a hood warp inward on my Mirage kit about 5 years ago. It was because the glass was not cured properly. The doors did coke bottle on me as well. It was so bad I had to put inch steel tubing in the door to stop the progress of the door swoop. It is mostly caused by builders using low quality fiberglass resin and mixing it too thick a layer over a layer that did not have time to cure out.

    Dave
    If you're not confused, you're not paying attention.

  4. #4
    Senior Member BondoBob's Avatar
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    Re:Fiberglass droop & summer heat

    I better get off line now because Dave thinks Im working on his car ;D

  5. #5
    Senior Member johnjs's Avatar
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    Re:Fiberglass droop & summer heat

    most bodies are made from GP resins or general purpose resins , also called "Orthophalic resin .. a step up from that is an" ISO RESIN " it is also called tooling resin ....a fair bit more in cost but a superior product with greater heat and chemical resistance making it a good choice for an engine deck lid which would be exposed to an excessive heat cycle ,similar in some ways to the way a mold can warm up a bit during cure and then cool ,but not to the same extreme .Another thing about fiberglass(and other products) in general from a design point is that it gains strength in a complex curve ...like a typical fender....but a flat surface or small expanse of a curve like a hood deck or roof will need more support .Either in the form of a liner ,framework ,or be thicker to start with ...john(Fiberglassworkshop)....I don't usually rattle on .. couldn't sleep this morning ..lol..

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