Howdy, I'm a new member here but have looked around here a lot for ideas for my boat. I was reading through your thread and saw you were thinking about using Herculiner over your aluminum deck. I was just going to give some insight on the experience I have had with Herculiner, which was not very good. I rolled the bed in my truck with 2 complete coats. Followed all the instructions on the can. Cleaned, scuffed, wipe down with Xylol, and then applied 3 extremely generous coats and let it cure without being driven or used for several days. I can't recall whether I bought 2 gallons or 3, but I think I bought 3. They were on sale at the auto store, and I had a friend who worked there, and he hooked me up with his employee discount. I got a great deal. The stuff looked AWESOME for 3-4 months. But, I use my truck extremely often, especially the bed for hauling. I buy steel fairly frequently as I build custom front/rear replacement bumpers and other truck/jeep/4x4 accessories or anything out of metal for fun when time allows. After a few trips, it was gouged out and gone in several places. Also, this Texas heat where I live gave it a hard time. The bed would get so hot, the Herculiner would get soft and mushy and would come up extremely easily. The sun also faded the black Herculiner and it just looks extremely patchy and bad now. The stuff I got and all the Herculiner I have seen is also very rough on your feet. I definitely wouldn't want to walk around on it barefoot when it is hot outside. Maybe I have just had a horrible experience, but I don't think that is necessarily the case, as very similar things have happened to several friends who did this as well. Their bed liners just thinned out much faster because they did not do as many coats.
Your boat is absolutely amazing, and I would hate for you to have the same experience I did with the Herculiner. I am very impressed by your build and will keep looking for updates.