That final spray finish can be any number of products. I personally use spar urethane (usually by Minwax) on most projects. It has a UV protection that alot of them don't. A clear acrylic, poly urethane, spar urethane, shelac etc. normally comes in a variety of finishes. matte, semi-gloss, gloss, high gloss - it's all up to your taste. I don't care for the crylon - not because of the product but because of the spray nozzle. I look for a fine mist nozzle. The regular spray nozzles on paint cans is too heavy a spray for me. I would rather do a few light coats instead of a heavy one. That final finish spray is a matter of personal taste, they will all give you a nice finish.