I wouldn't do it
Currently I'm right in the middle of painting my deck and cabin area (everything above the rub rail).The preparation required to get to the point where you put the actual top coat of paint on the boat is significant.Here is what I was told to do and/or have gleaned from the product manuals and/or have already completed.1. Pressure wash the entire deck area. DONE (2 hours)2. Remove crappy silicone job at rub rail and around windows. DONE (2 hours)3. Remove all wood hand holds, hatch handles and companionway door surrounds. DONE(2 hours)4. Repair and Sand the crappy repair jobs done in a half dozen areas DONE(2 hours)5. Scuff-sand the entire deck surface to prepare for primer. DONE(3 hours)Remove or tape all deck hardware (2 hours)6. Mix two stage primer and apply within the 90 minute "pot life" of the product. Done in two seperate batches. DONE (4 hours)7. Dry and Cure time DONE (Two Days).8. Sand with 300 grit to remove brush and roller edge marks, drips and misc bits (like bugs). 33% DONE More work to come tonight (4 hours)9. Clean with pressure washer. (not to close) (1 hour)10. Dry for (2 or 3 hours)11. Mix one half of total paint supply and apply first coat with brush and roller. (2 hours)12. Dry and Cure (24 hours)While you wait:Pressure wash/strip and sand all wood pieces. DONE (1 hour)Dry (overnight)Apply exterior finish in three seperate coats. DONE (total work time 2 hours)13. Paint non-skid areas with interlocking second coat and apply non-skid material (2 hours)14. Dry and Cure (24 hours)15. Check for roller edge, sag and drip lines - sand with 300 grit (1 hour)16. Apply second coat of interlocked top coat paint over all surface (including the non-skid area) (2 hours)17. Dry and Cure (36 hours)18. Check for roller overlap and drip lines, see above for sanding instructions ONLY if required, then move to 3M rubbing compound for high gloss finish - only if required/desired. (3 hours)19. Let cure for 7 days before heavy traffic, salt water exposure, launch, etc.20. Enjoy a quality paint job for about $400. and 30+ hours of your time, that will last 5 to seven years (depending on winter storage practices) The physical PAINTING only involves about 3 or four hours of work. I don't know if you really save anything by using a spray can. You still have to do all the preparation. Spray would limit me to very early morning hours and only on wind-less, low humidity days. I would likely end up painting half the neighbourhood. For the Do It Yourself backyard boatyard type of paint job, I think spray paint is best left to the pros. Just my opinion.Richard