to figure out the square footage of a boat surface:
measure from stern gunwale around the bottom to stern gunwale (figure "A").
and the length of the boat (figure "B")
round up to the nearest foot.
example: my Lonestar is 7ft for figure "A" and 14ft for figure "B".
7x14= 98 square feet. so, it will take one quart of primer for one coat on the bottom only.
estimate two coats of topcoat color would be between 1.5 and 2 quarts of paint.
I usually only apply one good coat, then, next year wash it good and put on a thin fresh coat - looks great.
This formula is only for a QUICK guesstimate - but will put you in the ball park
for the initial purchase of your coverings.
personally, I do not spray finishes - I am a "brushing artisan" so to speak.
Adjusting the viscosity of a coating to suit my current climate conditions.
with fine tuning the primer and top coat paints, you can achieve a very nice
fisnish without brush marks, drips or runs.
great job so far, keep us posted.
Read, Understand and Follow the instructions on the label of all products you use.
Pay particular attention to the safety notes and heed the warnings accordingly.
any rags used in the prepping/painting process that have solvents, oils or paint on them,
lay them out in the open to completely air dry prior to discarding them.
.