I have never used alcohol on a boat (at least not to burn, drink is another issue) but I have in other walks of life. Alcohol is very hydrophilic, so when it gets water mixed in, it just dissolved into the alcohol. A cup of pure alcohol added to a cup of water is not 2 cups of liquid, significantly less. That means that a lot of alcohol you buy not specifically for fuel use actually has a lot of water in it. As a solvent, still works fine, but as a fuel, it needs to vaporize all that water which takes a lot of heat away from heating your pot. The next time you are at a pharmacy, look at the bottle of cheap isopropyl alcohol, it may be only 75% alcohol.
HEAT as a fuel line drying agent is fairly pure, but the red and yellow bottles are different types of alcohol.
Alcohol stoves do have one advantage that you will likely not need, they work in really cold weather that is why a lot of high altitude mountain climbers used to use them and why the Iditarod dog mushers use them to heat up food on the trail for the dog teams.
HEAT as a fuel line drying agent is fairly pure, but the red and yellow bottles are different types of alcohol.
Alcohol stoves do have one advantage that you will likely not need, they work in really cold weather that is why a lot of high altitude mountain climbers used to use them and why the Iditarod dog mushers use them to heat up food on the trail for the dog teams.