ORIGINAL: ameyam
Ok, I repaired the Reactor with 5 minute epoxy yesterday. Actually, adding microballoons converted it to 30 second epoxy- after mixing on a piece of paper or wood (thankfully) and then applying it in place with a stick (again, thankfully) and then adding in the BMs and then pushing it into the cavities with the same stick (and not using fingers for a change), it dried even befor I had a chance to take the model off my lap!
You should never use anything LESS than 30 minute epoxy with microballoons.
5 minute epoxy doesn't set quite as hard as 30 minute epoxy, and you are slightly weakening things with the presence of the microballoons.
It is better to use 30 ( or even 45 minute ) set epoxy with a smaller percentage of microballoons, then allow 24 hours for everything to harden.