Like all UV products, it concentrates the UV portion of light, the portion we cannot see but fish can. This product goes on the top of the finish. Myself, I think it does a better job than what goes into plastic where it can get "lost" in thicker baits or the middle of an opaque bait. The UV clear powder paint works good as it too is a surface use paint. I add the powder to all plastic I cook and use just because. The enhanced UV portion of a baits' color can be seen under black light but not with the bare eye.
I like this spray for use in dirty or stained water when crappie fishing. My long-time fishing buddy and I have seen several instances where using the spray had meant the difference between a so-so day and a very good day. On walleye/sauger we've seen where the spray made a difference on cloudy days in stained water: baits not sprayed were the least hit baits while those that were sprayed were hit harder and way more often.
I do know it can be "over used" when cooked into plastic. I've mis-judged how much to put in a batch of plastic for crappie baits and had the baits come out of the mold with a bluish tinge on them in just normal room lighting. Those baits in the water were more of a hazy blue, than say, purple or clear like they were supposed to be and wouldn't begin to catch a fish while baits made of the same colors with the "right" amount of powder were working just great. When I use the spray, I just give a quick one pump shot at a bit of distance of about a foot and let it dry [very fast drying]. The spray works great on bucktail and is where most of it gets my use. Flu-Flu type feather jigs will benefit from it too.
I have used UV enhancers in bass baits, and on bass baits, but cannot say that I have seen a difference. But then most of what I fish bass with are moving right along in the water and thru slop where reaction hits are the norm, not hits where the fish have time to study a bait and perhaps see the effects of the UV products used.
I know anglers fishing salt have huge success with these UV products.
