On Saturday I sanded all the filler primer on the passenger side down with 320, then wet sanded it with 600 then 1200 before drying it thoroughly. I had to fill a few tiny spots again, so I sanded those down and then shot filler primer on, this time with lots more thinner in. Much better result, nice and smooth. On Sunday I quickly sanded these areas, before turning it over, wheeling it out and turning it round to do the drivers side. This was very orange peely, so I sanded it all over with 320, filled a few more bits and shot it all over with filler primer again. Apart from running out of paint, this was completely painless. Fingers crossed I’m getting the hang of it now. Pictures of grey panels arent very inspiring, but here you go anyway!