The best stuff by far for gluing straps on your armor is E6100. Unlike its brother, E6000 which is often available in craft stores, this stuff is not as viscous and doesn’t sag or run. It stays right where you put it. It’s also great for glueing together armor where you want some flex or fill in gaps. It’s shinny black so it works perfect on the Death Troopers.
To apply we recommend squeezing out a strip on you strap or part and then using a wood stir stick to spread it out like a paste. Then apply part and clamp. Allow 24 hours for strength, longer if you are filling a gap.