Proper primer for aluminum is zinc chromate. Two coats, first coat up and down, second coat side to side..that way there are no highlights. There are several other types also, including epoxies, but the US Navy uses zinc chromate ... and most of their equipment seems to get a lot of salt usage for some reason.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
Last edited by Destroyer; 03-13-2012 at 10:02 PM.
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