i used to work in the sign industry and i applied vinyl all the time to glass and exteriors, but never to auto, best guess is that 1. vinyl will overtime either peel around the edges after washing or due to high heat it will crack. hopefully the 8 yr is high performance vinyl and will last a while. 2. bug juice will come off if you scrub it or presoak it first, im sure there is a spray you can apply that will ease the removal of bug juice, but be gentle with your vinyl. 3. it might leave a ghost after you take it off and may take off some clear coat too depending on how good the paint job is. and 4. i would just wait and get the paint done...skip the vinly, nothing lasts these days....talk to someone in your area who's does car wraps and they can give you more info. hope that helps.