Originally Posted by
smontanaro
As for the no-glue-opposite-the-valve trick. I'm aware of it but never seen to remember to it while I'm applying glue to the rim. Hasn't been an issue removing the (thankfully rare) flat so far.
I don't do it either, I have an old tire lever in my cycling wallet to get the removal started if necessary. And I am always a little surprised at how hard they are to get off... a testament to my glue jobs.