Marq would have more info on using Brightside, so I'll leave the details for him. I can't say I had any experience with it.
A few pages back, someone posted an Ebay dealer they bought 6 qts of Brightside from for $60, but the only colors available were red and blue. A few calls to local marine shops or boat yards/dealers should find a local source for you, though.
You might even check hardware or farm supply stores, with as many boats as there are in Florida, some may stock or be able to order the paint for you.
On your link, under Topside Paints, Brightside Polyurethane.

I want to die like my Grampa, peacefully, in his sleep. Not screaming in terror like his passengers.