If the tiger striping is minimal, and while running your hand over it, it feels flat, don't worry.

After a day or so, yes...it's "easy" to peel it down. The Kerdi won't fully cure for a number of days, but it's not the "pull off" strength that is important, it's the "sheer strength" that matters. If you were to grab the bottom of a sheet and pull DOWN, I think you'll find it impossible to slide it down and THAT's what a tile does! You could even try it on a sheet that was just put up...with the same results.

Bottom line is Don't Pick at It! (Remember your Mom told you that when you were a kid...)

Hopefully you were able to put back successfully peeled off and did not mess up the backer, if not be prepared to tell your tile guy what you did so he may repair your mistake (on your dime of course).

Bad Carla.

Bad, Bad, Carla.

What the other kids wrote. Leave it be and let the thinset cure.

So sheer strength is important on a wall however what about Kerdi membrane on a ceiling?

Properly applied, it should not be a problem.....