Yup, and they work well for spraying gel coat too.
There's lot of hints and tips and videos on the web ... usually linked to distrubutors websites.
"The secret" for spraying boat coatings, is to pre-filter the fluid before you put it into the 'bottle' and remove the teeny screen on the PreVal 'suction tube' ... so you dont waste a lot of 'propellent' trying overcome the 'thickness' of the usual boat coatings. Fine conical 'paint strainers' (from auto body shop paint suppliers) are the best for 'prefiltering'.