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Thread: fiberglass resins epoxy vs polyester

  1. #1
    Junior Member APPRENTICE
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    Feb 2005
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    fiberglass resins epoxy vs polyester

    hi, i am working on a race car body that was made with epoxy resin(or this was what i was told) .i had to repair a few small areas,etc and i used polyester resin (i did not find out that it was made with epoxy resin until after i repaired the areas with polyester resin). i have since bought the west system epoxy resin with the hardner.i have used this on the structural areas and i have molded the hood to the fenders. i would like to know if the polyester resin would be ok to fill in low areas over the epoxy resin? i know that i will have to use bondo for some of the final work,but i want to use the resin to fill in the small pin holes,etc.
    some of the people that i have asked said that i can use the polyester resin over the epoxy resin and it would be ok, but i wanted to get some more input on this.THANKS garym

  2. #2
    Member JUNIOR BUILDER
    Join Date
    Mar 2006
    Location
    Illinois
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    You should be ok. I believe the main difference is the polyester is a little more porous than the Epoxy. If you was laminating pieces together, I might worry but to fill pin holes, I don't think you will have a problem.
    The older I get the less i know for sure Dennis

  3. #3
    Member JUNIOR BUILDER
    Join Date
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    Location
    Illinois
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    duplicate deleted
    The older I get the less i know for sure Dennis

  4. #4
    Junior Member APPRENTICE
    Join Date
    Feb 2005
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    11
    hi, thanks for your reply. i called the company/chassis shop that made the body and they think that they used polyester resin.the mold that the body was made from i do not think was very good as there are alot of high and low areas. thanks again. garym


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