Great idea on using Primer 94 on the perimeter of the glass... never thought of that before. We also use black 220 vinyl 3/8" to 1/2" wide around the perimeter of the graphic to seal it down. It seems to hold up better than the 8914 (? I think that's the number) optically clear edge sealing tape. Have had great success with laminating vision film with optically clear laminate on large exterior windows and sealing down the edges with black 220, however not so much success in terms of longevity on vehicle windows using the same products. The curved glass of the vehicles seems to be more challenging overall (especially rear windows on some vehicles) and the dirt, salt, grime really are brutal on the laminate. The film seems to hold up fairly well, but the top dollar optically clear lam breaks down after a year or so and really looks bad after only a couple years.
I wish there was a better product available that would last as long as the vehicle wraps do? More times than not, the vision film (mainly the laminate I guess) looks pretty tacky well before the vehicle wrap does... any secrets on a better laminate that holds up better? Brand X says "1 year warranty" and an "expected life span of 3 years". We are not getting 3 years.... 2 years tops before it is shabby. I realize vehicles take abuse in the salt/snow/humid climates. Gotta be something tougher to match the performance of the cut vinyl and printed vinyl for the rest of the vehicles that holds up decent?