Darth Leere: I use acrylic paints also...more specifically Citadel Colour by Games Workshop. They can chip too, but I always prime my pieces first. I wash 'em w/ slightly soapy water, let dry completly, then prime w/ Krylon flat colors. I find that the paints stick more readily to a primed figure than non-primed ones.
Some customizers finish theirs w/ a sealer, but I don't...'cause I haven't foun one I like. I started out with the stuff you get from the hobby stores, but made the switch to the more expensive stuff several years ago. I still use the less expensive paints for mixing colors or painting large background pieces or miscellania.
