After the cab had been totally stripped and wiped down with Metho and rag, i left it overnight before sanding the cab back with 80 grit sandpaper and then filling the numerous dings and scrapes, i used Polyfilla for the smaller ones and builders bog for the larger ones. not much else was needed as the cab was still solid and structurally sound.
After lots of sanding, first with 80 grit on the builders bog, then 120, 280 then 400 grit sandpaper, then it was ready for the undercoat. I used White Knight brand enamel undercoat spray paint, first I put a couple of light coats to start with to see if i missed anywhere with the polyfilla, and applied some in any spots i had missed, then let it dry and block sand the filler back smooth, along with the rest of the cab with 280 grit then 400 grit before giving it a few more coats of undercoat.
