[Mgs] New wings question

[Howard Battan]

Hi folks. I just received four new wings for my '57 MGA, and need some 
advice. While the front wings are bare metal, the rear wings are painted 
with a black semi gloss paint. Is this a rust preventing paint, or should it 
be removed to bare metal before proceeding normally?

Thanks

Howard Battan
'54 MGTF
'57 MGA
'79 MGB