You can use it to store the boat under when you're done, one of the portable canopys would work as a paint booth. The ones from Sams Club has sides, usually around $200.
http://www.samsclub.com/shopping/nav...=5&item=102443
Careful about the accumulation of fumes while you're in there, wouldn't suggest a fan either. Just spray a section, let the vapors settle then do another section.