Suncatcher - The Gem Series - Rainbow Window Sun Catcher

After you stick this clear sticker on window and if you want to relocate it to a different location will it still stick? Will the stickyness overtime

Does the blue light emit from these stickers cause blindness?

Has anyone tried these on car windows? I am especially curious about sun roof application on a somewhat tinted sun roof.

When will these be available to purchase again? i need these in my life :) !