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Building Tips and technical articles. => Building techniques => Topic started by: Russell Shaffer on February 24, 2014, 02:40:52 PM

Title: crystallized epoxy
Post by: Russell Shaffer on February 24, 2014, 02:40:52 PM

  I have some that looks like old honey so I did a little research.  Dow Chemical says to warm it up and use it, so I'm going to try it.  For anyone who wants the whole Dow statement, look here:

  http://msdssearch.dow.com/PublishedLiteratureDOWCOM/dh_00cb/0901b803800cb76b.pdf?filepath=/296-01652.pdf&fromPage=GetDoc

Edit:  I heated it to 160F in a pan of water and it seems to be fine.  Totally "decrystallized" and looks fine.  Took very little time.

Title: Re: crystallized epoxy
Post by: john e. holliday on February 25, 2014, 09:50:21 AM

Hope it holds up and cures like it should.

Title: Re: crystallized epoxy
Post by: Gerald Arana on February 25, 2014, 10:32:54 AM

Your epoxy will work just fine.............

I have a couple gallons that get all "white" and a little heat  (on the stove top) brings it back to clear and useable. The catalyst doesn't change much.

It's only in full size aircraft that this practice is a No No or so my full size aircraft building buddy says.

Cheers, Jerry

Title: Re: crystallized epoxy
Post by: Dennis Saydak on February 25, 2014, 05:37:28 PM

I've stopped using the hobby store type epoxy for that reason. I have several gallons of Fullers Resiweld epoxy, which was used by the homebuilt aircraft guys that is now 36 years old in the jugs. I've used it several times lately and it is a good as the day I bought it. It takes a few hours to get set up and 24 hours for full cure. It is not brittle like the cheaper stuff that crystalizes.

Title: Re: crystallized epoxy
Post by: FLOYD CARTER on March 03, 2014, 02:34:03 PM

8 seconds in the microwave warms both bottles of epoxy and makes it much easier to pour and mix.  A pan of hot water takes too long.

F.C.