Maxi-cure Extra Thick is the best ca for most plastics, and is the best choice for plastic model assembly. When used with insta-set, it works better than any putty for modifying or filling voids. It can be carved with a knife or razor blade and sanded and feathered to form a finish indistinguishable from plastic. Maxi-cure bonds fiberglass, hardwood, metal and rubber better than any other hobby adhesive. Works great on 3D printed resin models, too!