That $140 treatment will not fly very well if you're trying to make art to sell, because if you show up at a gallery or art fair with that something like that they'll be laughing about you for the next 3 years.
The Achilles heal of mounted metallic prints is that they spotlight the tiniest ripple, speck of dust, bump in the substrate, and even the texture of dry mounting tissue. It takes skillful technique, special materials, and decent tools to produce a smooth looking, mounted glossy print. Tape, hot glue, hinges, corners, ordinary dry mount tissue, and ordinary adhesive are not on the how-to list if you want to keep that mirror-like surface from looking like glossy oatmeal or a fun-house mirror.
A big part of the reason Mr. Lik surface mounts his glossy prints is that it gets around the textural issues of any other type mounting. Surface mounting is actually a fairly economical way to go if you have a good production pipeline set up. The ticket is that you will waste a few $1000's worth of materials learning how to do it correctly, you need a very good laminating machine, and you must learn to control your emotions as you toss a high ratio of expensive, reject pieces into the trash.