Years ago I had a really nice heavy duty outdoor cover. Never again. It left print patterns in the paint that apparently had not completely hardened. Even worse, the humidity got underneath it and when it heated up, well, let's say I found rust in the most interesting places. Basically the cover was a huge oven. I would use a light indoor cover just to keep the dust off, but hey, right now with the bodies of my car dust is the least of my issues