Underneath is blueprint paper and under it wrapping paper. I used a glass cutter to scribe the pattern lines onto the wrapping paper. The cut outs from the wrapping paper than became the real patterns for the bulkheads, transom, bottom parts and side parts of the hull. Polyester was used more often in former times but less nowadays, since it doesn t seal very good and the boat would start to delaminate faster. I needed about 6 sheets of 4 x 8 ft. plywood for my 12 ft. dinghy and a lot more epoxy than thought because I sealed the boat two times.
Paint is the third biggest position in the material bill for the hull and the rest is rather minor.
I would seal only once if building a boat again. This does not only save money, it saves you also from epoxy noses running down your hull after sealing the second time. With the first seal the wood sucks the epoxy in, so the danger of running noses is not so big. Painting the hull with acrylic house paint for outsides and not with expensive marine paints. This would even save some more bucks on your hulls costs when using it instead of the micro fillers from epoxy merchants.