aluminium frame

[droid_ca]

well maybe just have to keep looking or find an alternative solution

[Shadow Catcher]

Galvanized screws bolts etc. because galvanizing is close to aluminum would appear to be the best choice. Available is cold galvanizing spray used to coat galvanized steel that is cut welded etc. It probably not work on a surface i.e. screw that is galled during installation. Rust-Oleum 7585-838 20 oz Galvanizing Spray Paint is an example and about $8 a can.
I am using gold anodized grade 8 bolts in a number of locations, SS, galvanized, and plain steel and will keep an eye on what happens.

[abby_normal]

here is where you can find Duralac in the US , we use it on Sailboat hardware

http://www.apsltd.com/p-15185-duralac-b ... paste.aspx

[angib]

Thanks for that - Duralac is so good that it's great to know where it can be bought in the US - even at sailboat supplier prices!