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I would be very careful using aluminum brazing rods on a boat hull. It’s going to take a considerable amount of heat and preheating time to get those rods to flow. The size of Rod also needs to be taken into account. Too small rod diameter and it will disappear before it will flow, too thick and it will stick and not flow. The size of rod also needs to be taken into account. Reparing a boat hull would be best left to somebody with an AC/DC TIG welder, especially one with a pulse feature. I have heard of it being done in DC mode however I’ve never done it myself. As Chris P says it has to be clean clean clean.
One difficult thing that people find with welding aluminum, is that there’s no color. When you preheat steel, the colour changes. With aluminum, there is no colour change and it’s easy to blow holes and thin material