Another technique that works, especially if dealing with extra stubborn mats, is to use a hot metal putty knife to melt the adhesive. To do this, use a blow torch to heat a flexible metal putty knife, and slide it underneath the mats after the corners have been lifted using the technique above. when using this method, be extremely careful not to touch the edge of the putty knife to any exposed part of the ski, as it will cut right through the paint leaving marks.