I hear it can be difficult to break the bead if you glue the rim. One guy told me he dropped a pair of wheels off to get the glued slicks replaced. The tyre guys had a real tough time breaking the bead, even with a machine and did a little damage to the rim. Maybe the guy put too much "glue" on them but he's usually pretty fastidious with his cars
The guys I use struggled to put the tyre on dry, it just wouldn't seat good and they're unwilling to put a lot of pressure into the tyre without a cage. They always put a little bead soap on there but said it would dry out. There's not a lot of tyre shops over here that understand the nuances of different slicks, most won't even do the job of mounting a slick on a 10 inch width rim let alone a 15 inch one