Need a little more information......
how old is it? Old growth cypress or grow back? Does it have or did it ever have some sort of finish? What kind of shape is it in? Does it leak. if there is no paint is the wood weathered?
old cypress boats were not built with tight seams and depended on the wood to swell to make them water tight. Most were left in the water and rarely, if ever, taken out. Cycling old cypress wet to dry and back again is not good.
what are your plans for it? Keep it in the water, keep it mostly out of the water, put it on display?
want to keep it looking “weathered” or look like it’s just been built?