Owning a boat can be quite costly. Maintenance supplies and licenses can be a bit much for someone who doesn’t spend a lot of time on the water. If, on the other hand, you’re essentially a fish without gills, then you should invest in the best boat maintenance supplies available.
Best is not automatically synonymous with most expensive. For example, I keep my Yamaha outboard motor well lubricated with Yamalube 2-M oil. It’s not the most expensive stuff on the market, but it is the most effective. Trust me; I’ve tried all the oil brands and I only trust Yamalube to keep my outboard humming along.