painting louver

[Delorean17@xxxx]

Hello,
My window louver is very faded and I think it is time to paint it. I 
bought a can of Bondo bumper black which is very close to the original 
color.(I couldnt find Krylon semi-flat black) what should I do before 
painting the louver? what do you use to remove the armor-all from it?

any help would be greatly appreciated.

Thanks
David