Bubbles are generally in the film due to foreign objects like hair or dust holds the film off the glass thus trapping air or by excessive heat boiling the adhesive and leaving bubbles in the film.
Yes for the rear screen you will need to "heat form" it to the outside with the backing sheet facing up, look on google on hints on how to dry shrink (i prefer over wet shrinking) plenty of videos out there.
You really want to find knife blades made by olfa that are stainless steel rather than the normal carbon blades as carbon scratch glass very easily. About $25 a pack of 50. I can use up to 4 blades a car or sometimes 4 cars per blade depending on who what where etc.
+rep for giving it a go yourself. Nice work
Cheers Graeme
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