I have just finished replacing the floor/deck in a 13' ft 1968 Crosby Sled. The old foam was wet and had to go. I need to blend the new with the old around the edges and conceal any evidence of glass work. I am thinking I need something that flows well and is easy to work/sand and have been looking at some standard filler resin mixtures. Before I jump in and start slapin chemicals together I would like to hear from the pro's. Sure would appreciate any suggestions.