I picked up a free roofbox that's showing its age and I'm considering spraying it. I've had good success freshening things up using acrylic sprays, but a roofbox has to cope with being blasted with air at 70+mph. I've googled around, and lots of people seems to have asked similar questions, but I can find no informed answers. If I go the acrylic route, I've got 2 choices 1) I have already got a couple of large cans of matt black, more than enough to do a large roofbox, but the original colour is the light grey, so if the paint does end up getting scratched a lot, it will look truly awful. 2) I can order in something similar in colour to existing, although I'll never get an exact match. Either way, should I finish with a lacquer? Any thoughts as to how resilient such a job would be?