Be sure its a vinyl decal and prepare the surface with some prepsol and you wont have a worry. If it sits in the sun alot then over a while once its removed it will have a shadow of the decal due to paint fading around it. Cheap stuff will die quicker and go all chalky and will flake off, buy a decent one and you can usually get 5 to 10 years life before it does it even being weathered.
A tip for good placement - buy a vinyl applicator and also draw a cross across the top tape strip to line up straight press in the middle and use the applicator to drag out to the edges. Will stick well and wont get air bubbles. Any little ones can be worked out by scrapingfrom centre to edge with the applicator.