Iron-on edge-banding is a quick way to cover up an edge on plywood. Trimming the excess, however, is tricky. I’ve tried edge-banding trimmers, but I find the results are unpredictable. With the trimmers I’ve tried, it wasn’t easy to change the direction of the cut to suit the grain direction of the edge-banding. If you’re cutting against the grain, you’re likely to tear out a chunk of your new edge-banding. Instead, I use a wide, sharp chisel. This way, I can read the grain direction and trim accordingly. Angle the chisel slightly and go slow, raising the back corner of the chisel just enough so that it doesn’t dig into the plywood veneer. Smooth the corner with a sanding block after trimming.