Polyester yarn is a difficult material to bond, mainly because its molecular structure is polyethylene terephthalate and there are few active functional groups. The general bonding methods are: polyester polyether and polyisocyanate adhesive. The best component for bonding small pieces of plastic is polar plastic such as ABS\PVC, so the above adhesive can be used. If it is rubber modeling, you need to add another chloroprene rubber component.