Hi,
Thanks for the advice. Its a steel frame - columbus sl to be exact. I'm not fussy about getting it perfect. I'm just concerned that as I start to put primer and top coats on that the unevenness will show through and it ill become a nonstop circle of sanding and painting. I'll look into leveling primers and will try and build up carefully. I've also considered slandblasting it but I'm hoping to avoid this if I can.
Cheers
Stephen