From Google:
Interlux Brightside Polyurethane is the most technically advanced one-part polyurethane available. It contains unique additives that make cleaning easier and help reduce stains and abrasion.
Brightside uses Polyflow 4000, a unique polyurethane resin, which yields excellent flow and leveling characteristics as well as incredible abrasion and chemical resistance. Brightside also takes advantage of the latest in ultraviolet technology which insures longer color and gloss retention. Together these technologies create a one-part polyurethane which gives the look of a two-part polyurethane with the application ease of a one-part enamel.
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In Norway we use different brand names like "Jotun", so Interlux might be difficult to find. But I wonder if I can use the 2 component topcoat I use on the fiberglass also on the mast. I guess I will need some primer where I sand down to bear aluminum. I do not have a paint room, so I will try to use a brush to put in on with, so the finish might not have the high glance I would like