That stuff your using has an uncanny resemblance to C4. Where do you mount the detonator Crash?
We have a two part material that we use in the HVAC industry that once mixed with your fingers does basically the same thing. I'll bet two bits it's made by the same Co.
Maybe it is C4? It has a funny taste and it burns.
I think I have seen that HVAC stuff. Is it like magic putty?
This plastic is reuseable.

It's not meant to be permanent though.
Below is the very quick and dirty frame. The bottom tube is a swivel for two air control surfaces. I may have to move the servos.
PS. Thanks for reminding me that I need to order some July 4th 'supplies'.
PPS. Are you going to try a CC board on one of your planes?