How to make the lines on commercial window as straight and as clean as possible?

Answer 1: Pulling the vertical seals will greatly improve the overall finished product. This allows you to line up the top edge and trip the bottom edge. Remember to avoid accidentally trimming the rubber. You may need to trim the bottom edge first to avoid this. Afterward, trim like you would a normal window.    Answer 2: Use a five-way tool to achieve a nice, clean edge. Not only does this help you keep your edges straight, but it also creates a very small light gap. In addition, it is very helpful when tinting corners.    Answer 3: Practice on the windows in your own home before you start on the client’s windows.    Answer 4: A silver triangle card will help you achieve a straight edge. Remember that the hardest part is the corner of each window, so this process will require practice if it’s your first time.    Answer 5: If you encounter any problematic gaps, run a bead of silicone around the edge.  Answer 6: For commercial windows, you’ll often find a half-inch aluminum piece along all four sides of the window. You can remove three sides of the aluminum, leaving the top piece. Note that this aluminum actually holds the window in place, so do not remove it entirely. The top piece will stop the window from falling out completely. After removing the aluminum, you can tint beyond the seal. This allows you to get a very clean edge without worrying too much about accuracy since no one will see the “true” edge once the aluminum goes back on.