Attach a down-cutting laminate blade to your jigsaw.
Position the jigsaw at the far end of the countertop where the counter frame meets the laminate. Hold the jigsaw at a 45-degree angle. Turn on the jigsaw and move it slowly down the countertop's edge. The jigsaw slices away an even strip of counter frame and laminate – leaving you with a beveled edge rather than a straight edge.
Sand the beveled edge of your countertop with 100-grit sandpaper. Only sand until the beveled edge feels rough to the touch.
Measure the length of the countertop and the distance from the top edge to the bottom edge of the countertop along the cut. Add 1 inch to your measurements on all sides. Cut a strip of laminate to size with a carbide-tipped scoring tool.
Apply a water-based laminate adhesive to the back of the laminate strip. Align the laminate strip with the top edge of the countertop. Push the laminate strip into place over the beveled-edge cut.
Roll a J-roller over the beveled edge to ensure that the strip of laminate properly adheres to the counter frame. Wipe away any excess laminate adhesive with a dry cloth.
Trim away the excess laminate from the edging strip with the carbide-tipped scoring tool.