Weatherbond-type exterior series; whichever brand you choose surface need to be prepped and primed properly (waterproofing acrylic would be good idea) as well.

That depends on whether they give C-grade paint (ok la cheapo paint but still paint) or F-grade (chalk powder fake paint) stuff.. the test is wet a cloth and rub it over the surface. If the cloth turns all white that is a real problem. If not, then its good news, just paint over lah.