I've managed to finish this off at last!
Since Christmas I've been re doing my boost gauge holder. I wanted to make it look a little neater.
So first I trimmed it down.
Then glued it into position.
Smoothed it down.
Filled it.
Sanded it down
Primer
Not once but twice the primer reacted and melted the top layer of plastic.
Then more smoothing
Then more sanding...
It's not as good as Graham's but here's my spray booth lol
Then finished!