As to the Tylercraft... I spent all winter researching twin keels and reading all I could. Opinions are all over the place... everything from "There ain't no good twin keel" (with apologies to Hal Bynum and Dave Kirby) to Hunter claiming their twin keel designs being almost
as efficient as their fin keels *shrug*. Only things folks seem to be able to agree upon: twin keels don't make any given design faster; a lot comes down to the sailor, not the boat. The secondary features to the twin keel sound nice, but whether they make up for any loss in performance... well, suppose I'll find out when I sail her. It's also been mentioned that I might do some good by fairing the keels to a proper NACA airfoil; might also be that would simply be putting lipstick on a pig.
Best case scenario, I'm happy with it. Midline: I sell it off and recoup (some) of the refit costs. Worst: I market it as a playground for some redneck kids on forty acres (being unable to sell it otherwise) after stripping her, sell off the nice galvanized tandem axle trailer that came with it, and I eat the repair costs as an educational expense.
I've used regular Rustoleum on my skin on frame kayaks... haven't been exceedingly happy with it, but it's outperformed everything else I've tried. Can't see putting it on fiberglass, though, when Rustoleum makes their TopCoat product and it's not exceedingly expensive.
Gimme a few years, and I'll report back!