It's amazing how the undercoat shows up the pin holes in the fibreglass, the wheel spats are the worst, but hey they are probably more likely to get damaged by rocks etc. so I am not overly concerned, I'll fill the worst of them and see how its goes. Anyway I managed to get undercoat on all the parts before the storm hit this afternoon, the heater is helping them all the dry at present, but even so the undercoat seems to dry very quickly on it's own. Tomorrow I'll give the whole lot a going over with wet and dry to see how much filling is required.