Use the factory edge of the paper against the bottom flap of the car window, (so you wont have to draw the bottom line). First draw the sides with the pencil, lift the bottom of the paper about an inch away from the glass and roll the car window down until the upper edge is exposed. Use the edge of the pencil lead to trace the top edge of the glass. You should now have a perfect, REUSABLE representation of the car window.
Take the pattern and lay two pieces of film, with the liners opposing, under the pattern.
Spray a little water in between all of the layers to keep them still as you cut.
Cut them on a piece of flat glass or a linoleum cutting table.
Here is an illustration
I shrink most car roll ups because I don't tape the flaps anymore and I dont want any fingering under the flap. To shrink the door pieces, I place the film on the wet outside about an inch above the bottom flap and aboutan inch to the left or right of the side felt, squeegee the film so that its tight on top and all the excess is on the bottom, then wet shrink the excess film on the bottom.
When you're ready to tint the car window, start with the glass rolled down so that the top of the window is about a half inch from the felt, Clean and prepare the glass to receive film, lay the film near the bottom of the soapy wet glass first and slide it down into position as you lay the top into position.
Then squeegee from an anchor point to keep the film from moving
working from the middle out. Roll the window up and squeegee the bottom out. Blot any water from the sides with a hard card wrapped with a paper towel.
Cut-away View of 1/4 Window
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