If you cut your own mats with a tabletop mat cutter, you know there’s nothing quite as aggravating as a board that slips mid-slice. Even an ever-so-slight shift will ruin the mat.
I’ve found a solution to my slippage problems in the form of “rug grip”—the rubber floor-gripping mat used underneath throw rugs. Simply cut a piece of rug-grip to the length of your straight edge and a little wider than your matboard. Place the rug grip beneath the mat slip-sheet (also remember to place a “slip sheet” of scrap matboard directly beneath the board you’re cutting to keep the blade tip from flexing or wiggling during the cut). For a final measure of stability, I often place another piece of rug grip between the cutter board and the tabletop.