I'm one who uses rubber cement - it solved all my ruler problems. It's nice because the ruler holds snug all along rather than just in a few little spots. It's easily removed/redone if it gets too linty. It does take time to dry, especially when the humidity is high.
As you walk your hand down the ruler, as others have mentioned, be careful never to let your hand get ahead of the blade. The blade jumped the ruler one time and I learned my lesson about that! It was just a little cut, but could have been much worse.