Used for .020" thick aluminum laminate, with no backing. Here's what has worked for me when cutting edges where the bearing surface will slide over the already installed laminate: FIRST: try to fit with a minimal overhang, like a maximum of 1/4". Uses a 3-blade porter cable chisel for the first cut, leaving the protective sheet on the face to allow the bearing to move over it expect hot chips to fly forward, stick to the protective sheet and make the router shake.cut first and make the mistakeβ¦