Epoxy. - RC Groups
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Feb 28, 2012, 08:28 AM
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Discussion

Epoxy.


Hey all, I have a question. I need to make some repairs to one of my planes, had to remove a few parts that had been epoxied. I got them out ok but now its time to reepoxy them in place. Do I need to sand off all the epoxy from the wood or will new epoxy stick to the old cured epoxy thats left? The parts make good wood to wood contact. Thanks!
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Feb 28, 2012, 08:50 AM
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It would be best to sand it off and reglue, but it would do ok with out any sanding.
Feb 28, 2012, 09:12 AM
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So sound like I should at least sand the epoxy off to get a good fillet joint. Thats stuff is hard to sand. Thanks for the help.
Feb 28, 2012, 11:18 AM
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Toysrme's Avatar
yes, epoxy will cure to itself (where pva/ar can be iffy & CA's typically wont bond well to cured CA)

for future reference get rid of the fillet joints during building. you don't use fillet joints with glue, ever; that's left for metal & welding. if a glue joint has a fillet, there's too much glue applied.
Feb 29, 2012, 02:44 PM
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kerwin50's Avatar
A little heat is a good way to remove epoxy. Epoxy really like to gum up sand paper
Feb 29, 2012, 08:00 PM
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Yes, definitely remove the old epoxy using heat. A 25-40 watt soldering iron will carve it out very easily. Most epoxies break down at around 400 degrees F, well below the temp of a soldering iron. On large areas where it won't hurt anything a heat gun will also work.

David
Mar 02, 2012, 07:58 AM
Registered User
Thanks for all the in-put. The heat gun and soldering iron with the blade tip worked very well.


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