You should but themn on before you polish it! Wipe the area that you are putting them on with pro boost or something like that then apply the Stickers!
AFTER polish!!!! If they're proper vinyl stickers, wet the back of them with a little soapy water, washing up liquid is fine, this help you place it where you want it without it gripping on to the car for dear life as they do
you'll have loads of replacements if you put it on after polish as it wont stick properly.
Before polish dude, bit of pre cleaner or methalated spirits to wipe clean.
[quote author=ericsti link=topic=7116.msg83404#msg83404 date=1210164856]
Wipe the area that you are putting them on with pro boost or something like that then apply the Stickers!
[/quote]