We use this stuff too (3M SCPS-55) and I agree it does work the best. I've tried other "comparable" masks and they never hold as well.
Definitely pricey but it just gets built into the cost.
Call Gregory1 in Ks 800-835-2221
They stock the transferRite 6792High tac (Spot graphics) and the 6782 Mid Tack for Prints.
Very close to equal 3M SCPS. and price is centered between RTape and 3m SCPS
It is consistant and a much heavier paper and adhesive.
In this business being Cheap or too tight causes you to lose money every Month.
You are failing to count lost productivity from your crew fighting the cheap materials.
The TransferRite goes down great and finishes beautifully.
It is worth the Money