Ok so I finished the bottom pieces of the boat last night and for the most part it came out pretty good. But as I expected where the side piece and the bottom front piece meet up isn't so good and I'm going to need to fill in some area. What should I use to fill it in? I have some automotive Bondo but I heard that isn't good to use for marine applications...so should I use a wood putty/filler or marine Bondo? Thanks!