Automobile Insulation Application Roller tool 1)The heavier the roller the easier for you to to roll out the foil. It is obvious that metal is a heavy material in comparison to wood or silicone 2)It's also important for a roller to have corrugated surface. This will prevent it from sliding. Moreover, the roller's corrugated surface will provide you with a years of prolonged service. 3) You need to apply efforts to properly roll out the material. Roller has to be rigid to prevent it from breaking. Metal roller can guarantee a quality insulation and long service for many years to come. Be sure to use metal roller if you are after competent insulation no matter what material you use.