I got mine off of ebay, it's a two part epoxy clay that you knead together. There are several different ones out there and all are about the same I would say. Thre is one called Apoxie Sculpt, if you google Apoxy clay you will get several different different varieties.
I also use to coat my noses but has the same problem as they would get bumped and then the coating would actually peel off, it just got to be a real pain, unsure if I was doing something wrong or not. ONce the coating started peeling off it look horrible.
Ooops just noticed that someone else already answered your question Daphne and Gail