Kahit ano gawin ko, I still don't buy it. I'd say more of placebo siya rather than actual science. If 3M's VLT is 5% and VKool's VLT is 5%, if their accuracy is correct, there should NOT be a "masmaliwanag".
I tried to throw the question kay Harvey (manager of VKool) pero ayaw niya magcomment regarding competing brands (which is professionally correct). Does anybody have a more clear answer on this?