Hi there! This is what I used and I believe most customizers used this as well. 1.) milliput cheap and does the job not good for doing predator dreads. Useful for most things flat( mask, belt, pouches.) 2.) aves apoxie sculpt honestly I don't see much difference with milliput, (correct me if Im wrong pls.) except the price bit expensive. Clay good for pred dreads. Needs to be baked at right temperature. Flexible when cured. There are probably more out there. I heard water sealant putty can also be used. Good luck friend.