comparing gelcoats

Discussion in 'Fiberglass and Composite Boat Building' started by crossram, Oct 31, 2013.

  1. crossram
    Joined: May 2013
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    crossram Junior Member

    I am currently making some car body parts without any gelcoat I plan on spraying a coat of duratec after all the glass work is done.

    I have been reading where some cobra manufacturing companies build their fiberglass bodies using tooling gel coat, is there an advantage to this, if so why don't other companies do the same?
     
  2. Herman
    Joined: Oct 2004
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    Herman Senior Member

    Tooling gelcoat for parts? Why on earth? Tooling gelcoat is high gloss, but usually a bit on the brittle side.

    For your car parts: Use a sandable gelcoat. Most manufacturers carry these. (although you sometimes need to ask). This way the gelcoat can receive a good scuff, and be painted quickly.
     
  3. crossram
    Joined: May 2013
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    crossram Junior Member

    yea I thought that was weird, I am going to skip gelcoat and spray a few layers of duratec, this is less expensive, less weight and takes the stress off worrying about the gelcoat finish, what do you think?
     

  4. ondarvr
    Joined: Dec 2005
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    ondarvr Senior Member

    Using some type of gel coat in the mold makes it much easier to put a good finish on the part than trying to fair the surface and spray something on afterwards. Sanding gel is designed for this purpose, easy to spray in the mold, and easy to sand for paint prep.

    Sanding on bare glass opens many small pits and imperfections that can be difficult to cover prior to painting.

    Like Herman said, tooling gel coat is rather brittle, plus it has little or no UV protection, this results in a poor finished part.
     
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