What paint did you use mate? Highly reccomend two layers of krylon on top of some primer to be safe. Clear coat if you're extra concious about it. I think if you don't want it to chip you're supposed to let it dry for like 3 days.
You should really do it in 3 or 4 very thin coats for best results. If you're using Krylon you only need to leave it 20 mins or so between coats, so it's not going to take too long.
