I've been involved with a substantial number of these types of products and hands down, the vast majority turn out to be advertising hype and little more then a marketing
ploy of some sort.
A classic example is the "Coppercoat" type of products. They don't work and any reasonably chemically inclined person can tell you why with a material data sheet in hand. The "ploy" is to use two well known and accepted base products (copper and epoxy) and incorporate them into a single
product, backed with some self serving testing. Lets face it, if a bottom coating says "copper" in the name, it's got to be good, right? Simularly if a coating has the word "epoxy" in it, then everyone knows it's just got to stick like crazy, right? Well damn, lets put them together, like peanut butter and chocolate and see how many suckers we can net at full retail. Sure, someone will run comparative tests, but hell we'll sell a million units before they catch on!
This aside, my understanding (chem E, BA from U of Delaware) of the product mentioned above is it's one of the new strains of polyurethanes. These latest non-cyanoacrylate urethane s are showing promise and some are exceptional. I've been involved with one in particular and it's test results are nothing short of spectacular. Personally, I've never seen or used Linless's Crystal Marine
Pro. Their web site, product presentation and market impact to date suggests less then game
changing results or everyone would be talking about it.
In the end, if you want to take a shot with a product that's not being professionally endorsed by anyone that I can see, then you've got bigger balls then me. And no, the bonehead from "Ship Shape TV" isn't someone who's opinion is worth repeating, though he does appear to be a well meaning bonehead.