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Resin

Old 12-05-2014, 02:01 PM
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bob62
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Default Resin

Can anything be done to resin when it starts to gel and turns white

Thanks Bob
Old 12-05-2014, 02:06 PM
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Some say a little warmth such as a microwave can instill will thin and clear it up. In my shop if not used within a year it gets replaced.
Old 12-05-2014, 08:08 PM
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When in doubt, throw it out.
Old 12-05-2014, 09:06 PM
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With thanks for the comments, got a spoon full and a little aceton and mixed it up. It turned the right color, them mixed some hardner with it but it will not setup. In the garabge
Old 12-06-2014, 06:45 AM
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I purchased some new epoxy and within a month it started to crystallize. I warmed it in some hot water until the crystals dissolved. It's been good for a year now.

Ken
Old 12-07-2014, 04:28 AM
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Originally Posted by bob62 View Post
With thanks for the comments, got a spoon full and a little aceton and mixed it up. It turned the right color, them mixed some hardner with it but it will not setup. In the garabge
Acetone, used to thin epoxy, has to be added after the hardener.

I would expect your results, following your procedure.
Old 12-09-2014, 06:42 AM
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The garage may be to cold. Bring it in the house or set it in the sun.
If that doesn't work then consider Bob62's reply.

Good Luck,
KW_Counter
Old 12-09-2014, 06:51 AM
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At this point we don't know if it is epoxy resin or polyester resin. Personally I have never seen polyester resin go bad. Its hardener MEKP can and does go bad. Being that the resin has gone cloudy I'm going to assume it is epoxy. I agree with Tom that any additives must be added in after the epoxy/hardener have been mixed well. Acetone is usually not used for thinning epoxies. Usually 98% Isopropyl Alcohol is. It's always best to cure any epoxy at 70 degrees or slightly higher.
Old 12-09-2014, 08:21 AM
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Originally Posted by speedracerntrixie View Post
At this point we don't know if it is epoxy resin or polyester resin. Personally I have never seen polyester resin go bad. Its hardener MEKP can and does go bad. Being that the resin has gone cloudy I'm going to assume it is epoxy. I agree with Tom that any additives must be added in after the epoxy/hardener have been mixed well. Acetone is usually not used for thinning epoxies. Usually 98% Isopropyl Alcohol is. It's always best to cure any epoxy at 70 degrees or slightly higher.
Great Planes
Old 12-09-2014, 08:27 AM
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Ok so we are talking about epoxy glue as opposed to resin?
Old 12-09-2014, 11:25 AM
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Several years ago Dave Brown commented that resin that crystallizes can be restored by heating in a microwave for a few seconds. He also commented that only the better resins have this problem due to high solids content. Remember, he sold this stuff and should know.

I've often heated thickened resin and had no problems with the epoxy curing.
Old 12-09-2014, 12:52 PM
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I've not heard that before. During my classroom training I was taught that it was because of contamination, moisture or improper storage. One of the reasons the Aerospace industry sets an expiration date one year from date of manufacture or delivery depending on the actual product. Will it work for the purpose of an R/C model? Most likely yes.

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