Frontside,
I've found that applying several "dust" coats of Future, and letting them dry a bit is really needed to obtain a gloss coat with the stuff. I find once the dust coats are a bit dry, I hit it with a slightly heavier coat, let dry a few minutes, and then one final wet coat for the final gloss.
I've found that one initial wet coat just produces "fisheyes" or skips, or even areas where the Future refuses to flow (even after cleaning the model with detergent or isopropyl alcohol).
As Ivanho says, just spray it full strength, no dilution, at anywhere from 10-15psi. The stuff should be completely dry in 24 hours, but I usually wait 48 before subjecting the model to rigorous handling.
Good Luck
Lee Tree