Easyflo 60 casting resin is very tough, durable plastic once set and is easy to paint. I try my best to eliminate all air bubbles and to make sure the casts pop on and off the figure easily. Some work may be required with these head casts like removing small air bubbles or doing a bit of sculpting here and there. If the head cast has long hair or anything else that may stop it from popping onto your figures properly then just heat the head cast up with a hair dryer or heat gun until slightly soft then put it on the body in the position you like. Once the resin cools down it will stay in the same position you positioned it in.