In production we would keep Butyl tape in a wooden box with a light bulb to keep it warm, which made it much easier to work with.
Any that was squeezed ot would be easily trimmed with a plastic putty stick.
Removal was with a plastic putty stick and citrus cleaner. Tried many things but that seemed to work the best.
In the last couple years the switch was made to foam
with some still using butyl.
The butyl still has a better seal IMO