Does resin & mekp go bad?
Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=25923
Printed Date: May 25, 2025 at 5:33 AM
Topic: Does resin & mekp go bad?
Posted By: Simplemitch
Subject: Does resin & mekp go bad?
Date Posted: February 05, 2004 at 10:24 PM
I'm working on my first fiberglass project since 7 years ago (where i did a patch...) and i'm having a problem. I'm making a speaker pod, kinda bullet shaped. I carved the base out of floral foam and then went to glass it. On my first try i tried to eyeball the resin/mekp mix and totally did not add enough hardner and during the night, the mix ate away alot of the foam and did not even remotely cure. So... i sculpted a new foam piece and this time i meticuosly measured the resin/mekp mix then glassed up the foam and let it set over night in my shop which is about 68 degrees. Much to my surprise, when i came in today, it still hadnt even BEGUN to set up. I thought at first that maybe it was a chemical reaction with the foam, but then i realized that even the resin mix in the mixing cup hadnt set up at all! The resin/mekp im using has been sitting on a shelf in my shop for like 2 or 3 years, so i was wondering... Does it go bad? or am i doing something wrong? one thing that struck me as odd was that i remember the resin getting hot when i did it 7 yrs ago, but these 2 times there seemed to be no reaction.......
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Mitchell Whitney, Installer/technician
Mainstreet A/V
Replies:
Posted By: lspker
Date Posted: February 05, 2004 at 11:18 PM
Yes, the hardener mekp will go bad. Try some fresh hardener, should work.
Posted By: Simplemitch
Date Posted: February 06, 2004 at 12:06 AM
will do. thanks
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Mitchell Whitney, Installer/technician
Mainstreet A/V
Posted By: GMC4x4Guy
Date Posted: February 06, 2004 at 12:55 AM
I'm pretty sure that the MEKP hardener does not go bad. Resin definitely does though.
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"Drive it like you stole it"
Posted By: beyondamfm
Date Posted: February 06, 2004 at 1:52 PM
From expreience I would say it is the resin that goes bad not the MEKP hardener.
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The Clear Bra Guy
KCs premiere paint protection guru
Posted By: toosweetaudio
Date Posted: February 06, 2004 at 2:25 PM
I used to work for a company who sold all fiberglass products and YES the resin will go bad after about 3 to 5 months and the hardener should last you about a year
Posted By: Wherm
Date Posted: February 09, 2004 at 5:14 PM
the resin goes bad, you could use a heat gun on it to start the hardening reaction. My resin was about a year old and din't start to harden until i hit it with the heat gun. This is a last resort only. you have to be careful to not warp the mold cause of the heat. recommended shelf life is 3 months -------------
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