Good news, filler seems to have been mixed correctly, but now I need to sand everything flat again. While being a bit tired of sanding, I decided to give it a water test. It was sitting in the tub for about an hour, with a couple of tupperware cases filled with water and no leaks were spotted. That means the hull nearly finished and I can start on the superstructure.
But I wanted to ask what batteries will do. Should I go with lead acid 12v 10-12ah or are there better batteries around? Going to use the Action kit which is recommended for this boat, but I just need to find decent batteries which will give me good run time.