I can understand using 3m cast with a printed job, but what do you use on a box truck when it's mostly cut vinyl.
You still have the problems with rivets. You can't print a simple phone number and put it on just because of rivets.
That would be one expensive job. do you use calandared ?
BTW... I have printed on 3651 and put it over rivits. Not an easy task, but it works. Looking at it many years later, it seems to still be Ok