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A lighter epoxy than J.B. Weld

2K views 14 replies 8 participants last post by  DrDirt 
#1 · (Edited by Moderator)
Hi all, new to the boards.

I'm looking for a lighter epoxy than J.B Weld that has similar stiffness and flex strength.

All suggestions are appritiated, thanks in advance.
 
#4 ·
You want a 2 part liquid epoxy. Anything will work like locktite or gorilla. It's hard cause you only need a little and unfortunately the "little" packages are quick set epoxies. Usually 5 min. Alot harder to work with but will do the job. If you know someone that has something like west system epoxy then that would be ideal, otherwise your stuck with the quick stuff…
 
#11 ·
You can get longer set epoxies at hobby shops that sell RC airplanes and such.
Our local shop has up to 60 minutes - but 5, 12 and 30 are most common.
When I was glassing the foam wings on RC airplans, we used Zpoxy from the hobby shop.

For Z-Poxy and Smooth 'n' Easy, I use 1 part resin, 1 part hardener, and 1 part denatured alcohol (don't use rubbing alcohol, which is diluted with water). Mix thoroughly. The alcohol won't effect the strength of the final product. It's very volatile, and it'll evaporate well before the resin starts to cure.
 
#15 · (Edited by Moderator)
Yep it would flow - I wouldn't thin epoxy for laminating strips of wood. Not sure it would be a problem, but I am not sure when the sandwich would be clamped up if the extra solvent could escape before the epoxy set up, versus creating a weak joint as the solvent goes away over several days and leaves voids. I haven't used acetone, but that is because acetone would eat the styrofoam cores I worked with.

We always thinned for doing the glass mat - same for flow would work for glassing wood strip canoes/kayaks etc.
 
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