Jared, it all gets down to how you want it to look when you're done. The Monstaliner is a great idea if you don't mind the rough surface. Totally maintenance free and shouldn't ever chip or flake if you've prepped the surface per the instructions.
The other option is to use a single part polyurethane marine paint
, like Interlux Brightside. These paints can be rolled on and "tipped" with a high quality brush for a shiney surface finish that will look like it was sprayed. Again, you'll have to prep the surface per the manufacturers instructions. You can find these paints and video instructions on the web at places like Jamestown Distributors. I suspect the Marine finishes will be more expensive than the Monstaliner by the time you're done.
Good luck. Send us pictures of the work and final results !!