Pudnucker,
I had 15-20 year old oxidised paint on my aircraft when I bought it 3 years ago. The dark blue oxidised very well to a very dull matt.
I used the G3 and G10 along with Mer to finish. It took a
huge amount of elbow grease! But it had to be done by hand, HWMBO is a light aircraft engineer and would not recommend an electric polisher for a variety of reasons.
Farecla also do a uv wax polish - so once it does polish up you can protect it. Will try and dig out the pictures to show how well it came out later. Unfortunately being parked outside in a south facing position some parts need doing again!
