On 12/30/2011 10:00 AM, willshak wrote:


He didn't say what type of epoxy he used, but he was wrong about the JB
epoxy. JB Kwik is rated to 300ºF and bonds in 4 minutes. Cures in 4 hours.
The regular JB Weld is rated to 500ºF, sets in about 5 hours, and cures
in about 15 hours.
I have used the JB Weld and it remains runny for a long time. I didn't
time it, but when checking it after after an hour or so, I could still
move the epoxy. It also still stuck to my finger.


I use regular JB Weld from Lowes to make pallets of scrap circuit board
material to go through our convection soldering oven. We do both leaded
solder paste and lead-free solder paste. The pallets go through the oven
hundreds of times without epoxy problems. The circuit board material
begins to delaminate, but the JB Weld is still good. It does get rather
brittle, however.

I have been able to speed up the setting and curing of JB Weld using a
heat gun to raise the temperature of the material. Usually is set by the
second hour of occasionally heating all the joints. It still lasts as
long as joints left alone for 24 hours.

Paul