No one need to reply to this, but thought i would share my joy at a 'discovery' i made with my paint work. My 73 has an old 2-pack paint job (polyurethane clear over base colour). Its at least 15 years old, as the car has been in Oz for 13 years. And its showing its age.
Well everyone is telling me you can't sand it and you can't use cutting polish on 2-pack as it will just dull the surface. They all say, you will have to re- paint the whole panel. I didn't have anything to lose so i got some 2000 grade wet-and-dry and using soapy water i lightly sanded an area of both the old paint and some new painted area i had done last month that had one of my horrible blends and paint runs. After sanding it looked very shiny when wet and very smooth; now the rough, crystally blended area was almost gone and the runs had been sanded down smooth. When it was dry, the surface was a satin finish. I got some cutting polish and rubbed hard with several applications, then folllowed by McGuires top coat finish polish. The result was that it came up like a mirror! Just great. I was very pleased.