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 Post subject: Polyester Resin, Polyurethane Resin
PostPosted: Thu Feb 14, 2002 4:57 am 
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Joined: Tue Jul 25, 2000 2:35 am
Location: Oshawa Ontario Canada
I just wanted to tell everyone about my experiences with the long-term storage of polyester and polyurethane resins.

I bought a gallon of polyester resin in Sept 2000 and now it is semi-polymerized gunk which won't catalyze at all. I talked to a chemist about it and it seems that it polymerizes slowly just sitting in it's tin container. The lesson I learned? Don't buy a lot of resin if you aren't going to use it all. In fact I should have made a ton of parts from what I had when the resin was still relatively fresh.

Now the polyurethane resin is actually starting to crystalize, but it will still basically do it's thing. I bought it a few months ago, and I think I'm getting close to the point where it will stop working. I doubt very much if it will work after a year.

Don't buy more of this stuff than you need, you can always buy more resin later. I thought the polyester resin would last a long time, but after a year and a half it's molasses.


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