Upol D Metallic filler . Halfords sell it in smaller tins , about £5.00 .
I used 320 grit , then primed it , sanded it , primed it until i was happy then about 3 or 4 coats of colour until it looked good , then 2 - 3 coats of lacquer .
Your better off getting your paint in rattle cans from a local body shop supplier or motor spares place where they will mix the paint for you . The nozzles on their cans spray better than the off the shelf ones from Halfords .