I have a window in my shower - will peel and stick tiles work to keep water off the window sill?

Question

What prep work shouldbe done before sticking the tiles down?

Answer 1

I would install a water proof curtain on the window to keep water off the whole window

Answer 2

Yes, it will work until you turn the water on in the shower. Then, water will run down the crack between the tiles and ruin the sill.