Tire shops sometimes use a bead sealant - tar-type stuff, don't know exactly what it is though, almost like rubber cement.
When you break the bead loose with the machine later, it seperated easily enough. You get a bit the sealant strings between the wheel and tire, but nothing gets damaged.

1986 Pickup extracab longbed "Woody edition"
SAS - 33's, 5.29's, lockright rear.

02 IS300 SportCross - my "DD"
94 2wd v6 extracab
04 Outback Wagon- wife's/family car