Re: what kind of primers better on Aluminum boat?
HI csi. Most folks here in the forums use aerosol, Zinc-Chromate self etching primer on their aluminum hulls prior to paint. The procedure is fairly simple really. 1.) Sand any old, loose paint from the hull and/or get it soda blasted down to bare metal. 2.) Apply a light coat of ZC self etching primer let dry, apply another light coat of ZC primer if needed. 3.) Apply paint of your choice. There are many brands and types, but folks here have had luck with Rutoleum Marine, Interlux brand, and others. Do be mindful of possible adverse interactions per Home Cookin's post. You can apply the paint with a foam roller, or sprayer if you have access to one. You may also want to research the "Roll and Tip" method of painting which folks have also had good luck with.