OK, so I finally got a little tin of Proofide for my new Brooks saddle - but I can't open the tin! The tape securing it shut wouldn't come off, so I got out a knife and cut it. I know the tape is cut all the way around because I've gouged into it so much the paint on the tin is now scratched all the way around the tin. But the lid won't budge. I mean - not even one millimeter! I got out a knife and tried to pry the blasted lid off, but it still won't budge. It's like it's glued or something. How did you get your tin open? Any suggestions?