Heat Gun.

From CosplayWiki

A heat gun is an industrial strength hair dryer. Commonly use to strip paint off the walls, they can be purchased at most any hardware store. Caution when using them as they get VERY hot. Heat guns are useful when working with wonderflex or other heat moldable plastic. You have to be careful when working with a heat gun that you don't hold it too close or apply too much heat to what you are working with, as it can burn things.