just dont leave it on too often. if it rains and you do a long journey the bonnet heats up and can cause reactions in the paint. has happened to me and fair few people i know. also don't encourage dirt to slip down, say going down a ruff road.
other than that they work.
Cheers bro, i take off regular and vac inside lol know what you mean just engine vibration can be enough to scuff abit! Any advice on a good clay/lube pal?? Fancy giving it a clay ready for the shows
Cheers