~By TintDude ~
The way I do them is kind of drawn out. I make a freezer paper pattern for them.
First I use a wooden ruler with notches every half inch and a dry erase marker dragged across the top to make my bottom line.
Then I use 1/4 masking tape lain across that line and the frit lines on the top and sides.
I then lay plastic coated freezer paper across it (spray some water on the area first) cut it roughly over size, smooth it out, and draw the lines with a pen using the edge of the tape underneath as a guide for the pen onto the paper.
The edge of the masking tape under the paper will guide your pen.
Transfer the paper to your cutting table, and draw the tapers onto it using something round like a roll of tape. Use the pattern to cut your film and install.
This way takes a little longer but the results are always perfect.