I’d like to pass on a few marine varnishing tips to help other boat owners obtain that hard, durable varnish finish which we all love to see. What you will need for marine varnishingAbrasivesIt is important to use good-quality abrasives such as aluminium oxide. Cheap grade with poor bonding of the grit may contaminate new work, with the grit getting embedded in the grain. Much of this can be removed by swiping the base of a plastic bottle across the abrasive surface, or you can purchase abrasive belt cleaner specifically for the job. Let the weight of the machine do the work: set it at medium speed and ensure the abrasive is not clogging and marring the wood surface.