Sunvista,
I have never heard of a professional painter using TSP alone to dewax/degrease/de-silcone a boat (or a car) prior to refinishing. You do not have take my word for it either - call your local autobody shop and ask them what they recommend for these 3 contaminants. You might get away with TSP, or you might not - it depends on what contaminants are present on your particular surface. TSP will do a good job on the grease/oil, but I doubt it will dissolve/remove ENOUGH of the wax (detergents alone don`t generally remove wax very well at all), and I am almost certain it will do almost nothing to remove silicon. TSP will, however, do a fine job of cleaning your kitchen cupboards prior to painting.
Regarding the paints volumes, they are clearly written out (PER COAT) on the link I provided and I cannot recall the specific numbers off-hand. Keep in mind I was spraying and I have given you an estimate on brushing volumes which can vary depending on temperatures, thinning, brand of paint and technique.
Good Luck,
Dave