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12-19-2006, 09:46 AM | #1 |
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Thinning Epoxy
I've got some Hangar 9 30min epoxy. I'm going to be using it with fiberglass cloth for strengthening some areas damaged in a crash. It's a bit too thick though.
What's the best common household thing to thin it?
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12-19-2006, 09:53 AM | #2 |
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Isopropyl alcohol.....99% is best.
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12-19-2006, 10:05 AM | #3 | |
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12-19-2006, 10:05 AM | #4 | |
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12-19-2006, 10:30 AM | #5 |
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If you are using epoxy for strength then do not thin it at all. Thinning epoxy with anything alters the properties of the cured resin. The thinned epoxy will not be as strong as straight epoxy. In some cases, depending on thinners and type of resin used, the cure process will not be complete. In some cases thinned epoxy will "Cure" to a rubbery state and that is it. Hardly suitable for strengthening a wing centre section.
To work a thick resin apply some warmth with a heat gun, this will make the resin easier to spread. HOWEVER, be careful here. If the resin has a fast cure hardener do not use heat. For the purposes of this discussion I would define "Fast cure" as any resin that starts to set up in less than an hour. Ed S |
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12-19-2006, 11:00 AM | #6 |
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70% will do.
The heat method will work also, sometimes I just warm the epoxy and hardener a bit in the containers, and that is enough to do the job. Best thing for glassing though is to use the proper finishing formula.
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12-19-2006, 12:07 PM | #7 |
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thinning epoxy
Why not just get the right stuff to start with. There is an epoxy on the market for use with fibreglass cloth. It is very thin and soaks into the cloth well and has a good working time. I always find it best to use the right thing for the job instead of trying to make something else work. Do it right the first time.
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12-19-2006, 01:59 PM | #8 |
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Finishing resin
Finishing resin is really the way to go for glassing.
I DO use alcohol thinned epoxy for fuel proofing parts like fuel tank compartments. Myles |
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12-19-2006, 03:12 PM | #9 | |
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Re: thinning epoxy
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12-19-2006, 04:37 PM | #10 |
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Thinning epoxy
As the others have stated, any time epoxy is thinned with alcohol, you lose strength. It may go on okay & look good, but it's chemical state has changed from what it was designed for.
West Systems Epoxy would work very well for what you are attempting. Many people, including myself, use this for applying fiberglass to wood & also for mould making. Rcjetguy
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