Fiberglass over epoxy problem (help)
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Fiberglass over epoxy problem (help)

  1. #1
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    Default Fiberglass over epoxy problem (help)

    hi.. i realize my post is out of place as this has nothing to do with boats but please help if you can
    (the other fiberglass forum i found is not accepting new members at this time)
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    so i'm building a loft in a bedroom and in order to keep a lowish profile on the railings, i've fiberglassed them for added strength..


    the railings were attached to the post in a mortise/tenon style using a slower setting epoxy (30 minute working time.. 24hr full cure as per the label/instructions)


    the railings were attached then left to set for over 24 hrs prior to doing the glass.. my problem is now, the glass won't harden in the areas near the joints (where the epoxy was used)..


    it's been over a day and a half and it's still un_sandable in those areas..


    the resin i'm using for the fiberglass is fibre glast's #83 polyester laminating resin.. the room is slightly cold so i've added a little extra mek (1tsp per 12oz as opposed to recommended 1tsp per pint)


    it seems as if the polyester resin is melting or reacting in some way to the epoxy which is preventing it from curing..


    so, anyway.. what do i do now???
    thanks


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  3. #2
    Senior Member johnf's Avatar
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    They make Epoxy resin Just don't use matt! (I think).

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    Senior Member OFFSHORE GINGER's Avatar
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    First off from the way i am reading this .....you used Epoxy to glue the joints together on the railings ( CORRECT ) and went on to use 83 Poly to do your glass work which is a no win situation because Polyesters are not compatiable for use with Epoxy, and to make a long story short you can use Epoxy on Poly or Vinyl just ~ not the other way around ,and if i was you i would figure out a way to re - prep those areas of concern trying to remove the the material or resin that has not harden because most likely at this point it will never cure .
    Last edited by OFFSHORE GINGER; 01-03-2013 at 01:49 PM.

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    Quote Originally Posted by johnf View Post
    They make Epoxy resin Just don't use matt! (I think).
    right.. i didn't realize that i could use that with fiberglass until earlier this morning

    but yeah, i've managed to clean up the goop and get down to the bare wood in the problem spots and i'm going to go over the whole thing with an epoxy resin

    thanks

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    Quote Originally Posted by OFFSHORE GINGER View Post
    First off from the way i am reading this you used Epoxy to glue the joints together on the railings ( CORRECT ) and went on to use 83 Poly to do your glass work which is a no win situation because Polyesters are not compatiable for use with Epoxy, and to make a long story short you can use Epoxy on Poly or Vinyl just ~ not the other way around .
    thanks

    yes, you are understanding correctly.. and yes, i've added a lot of unnecessary work and cost to my project

    but i'm going to do what you're saying and put the epoxy over the poly (which has cured great in 98% of the areas)
    thanks for the reply OG!

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    Senior Member OFFSHORE GINGER's Avatar
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    Quote Originally Posted by Jeff Hammond View Post
    thanks

    yes, you are understanding correctly.. and yes, i've added a lot of unnecessary work and cost to my project

    but i'm going to do what you're saying and put the epoxy over the poly (which has cured great in 98% of the areas)
    thanks for the reply OG!
    Jeff your only human and once again try to re- prep and remove as much of the un - cured resin as possible ( Poly ) before applying any epoxy .

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    Senior Member Lefty's Avatar
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    When I glued my boat back together after replacing the side I epoxied it together and could not vinyl resin over the areas that had epoxy. I ended up digging all the epoxy out on the inside and then vinyl resined and the same for the outside.

    "I like boats that go FAST!"

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    Senior Member Lefty's Avatar
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    Here is a pic with no more epoxy.

    "I like boats that go FAST!"

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    Senior Member OFFSHORE GINGER's Avatar
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    Lefty , not to be rude .....but that is a lack of knowledge on your part or should i say was more or less a learning curve on your end , and just curious why would you use Epoxy , and not do a little re-search prior to using it at all .............................or seek information on the Pros and the Cons ~ do's or dont's so to speak ?
    Last edited by OFFSHORE GINGER; 01-03-2013 at 03:28 PM.

  12. #10
    Senior Member Lefty's Avatar
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    I find your comment a little rude, but I have seen your post before and think its just how you respond. I posted to show I made the same mistake as He did. I took the advice an expert and decided to finish it the way I wanted. It has came out very nice and is very strong. I am still working on it.

    Last edited by Lefty; 01-04-2013 at 01:38 PM.
    "I like boats that go FAST!"

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