CAUTION: The edge of the cut profile can be very sharp. Be sure to wear gloves when handling the raw edges, and sand the edges prior to installation.
Cut the entire InstaForm profile to the desired length with a saw prior to using the cutting tool. Use the enclosed cutting/sanding tool to remove the one or two pieces of the profile as necessary to obtain the desired shape. Slide the cutting tool in a smooth movement on the length of the profile, and then take off the piece to be removed. Sand any unevenness by using the sander found on the edge of the tool.