question with car sticker?

[Jimmy D]

so, i have a jeep wrangler. and im tired of people thinkin im a liberal or somethin cuz of my car. so im going to get bumper stickers that, well... object to liberalistic ideas. anyway, im not putting them on paint, is it ok if i put them on the metal fender and decide to sell it and take them off later without harming it? also, im gettin an American flag sticker, would it be ok to put it on my fender too? (maybe on the windshield?) id hate it to be disrespectful, but i dont wanna hurt the resale value of the car