Boom Painting
I agree with Ron. To do a proper job requires considerable time and energy. I repainted a mast a few years ago and found, the hard way, that this is no place to take shortcuts.....especially if you intend on keeping the boat. I would add to Ron's suggestions by recommending you use some kind of gasket or film between the stainless fittings and the aluminium boom whever possible, to help prevent corrosion. I also used a thin film of silicon on the screws and bolts for the same purpose. The mistake I made , after properly preping and priming the mast, which took considerable time, was using a good one part paint instead of Imron, or some other two part epoxy paint. I was anxious to get in the water early and did not want to wait for the correct temperature required for the appliation of epoxy paint. Your situation is a little less critical since it involves only the boom, however, be aware that If you do not do the job correctly you will have to do it all over again in 2 or 3 years. One further thought, although it is possible to do a really good job by using a good brush you might want to consider the ease and other benefits of using a sprayer.PAT