firstly what facilities do you have to work in ? , obviously the more effort that you spend on the preperation of the hull / cabin then the better the final finish should be ! personally i prefer to spray paint larger areas , either with a compressor & spray gun or with an aerosol can , as i no longer live on my own & now live with my girlfriend i have to spray on our balcony so use the aerosol tins , to improve the final finish you should wet n dry sand between coats with progresivlly finer grades of paper ( the higher the number , the finer the grade of grit ) i normally use 600 before the final top coat is applied ,