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Not that I prefer it, but I've used tons of dusted crystal, and ikarasu is down playing how freaking invisible the stuff is after masking. "Is this side up?" gets asked repeatedly. Any more I'll trace out key elements with a pencil when I'm done masking so I can measure without hating myself.
I did get some mactac for a printed set of doors, worked great, though I was sure I'd screwed up after install, as there were a ton of marks in the glue after removing the mask. A week later and it all settled into a uniform finish, but I was sure I'd be redoing it when I left site.
Mactac is much easier to use -- way less tacky than 3M (and less expensive to boot). I always digitally print the negative space on frost vinyl b/c it's way too difficult trying to find the cut edges for weeding. Just a light 15-20% black does the job, and it still looks fine even if the plotter gets off a tiny bit.
Oracal/Orafol 8510 is the easiest to install in my opinion.
If it's difficult to see the vinyl (ie: 3M) through the premask, I ask the sign company providing the vinyl to rub the outline/perimeter/edges with a construction crayon. Pencil lead can easily get on your fingers and find its way into the adhesive side of the vinyl when you're handling it. The crayon is a much cleaner and fastee method.