I am a newbie and have learned a lot but have a lot to learn. I have no problem with banners and core plastic but everytime I try to do metal signs I get a bunch of little bubbles under the vinyl. I clean the surface with alcohol, tape in middle and lay one side at a time.. I've tried squeezes, rolling pins and other things... Is their a trick, or do I need a tool like the Big Squeezie.. If so what model for a 24" cutter? Thanks Denny