[Yaesu] cabinet painting

[Michael - VE3MKX]

Hi,   Im starting to get frustrated painting an aluminum radio cabinet. 

Here's the problem.   I sanded the old paint surface down...  I primed 
it, light grey primer....  Then I paint it with Tremclad semi-gloss 
paint.  _The primer went on great, a perfect paint job._ 
Every time I try painting on the final colour, it goes fish-eyed 
(bubbles on the surface of the metal)  I later sanded the surface, prime 
then paint..prime goes on perfect...same thing.  I even used rubbing 
alcohol to clean the surface before painting.... same thing - fish eyed.

Any thoughts??

73 Mike