Right then and there, I changed to a manly stick deodorant. I've kept an eye on the purveyors of dubious spray-on products ever since. For instance, a home inspector buddy of mine in Seattle just told me about a homeowner who needs to fix his tired old slate roof. Understand, slate roofs are rare architectural treasures, and they can last for centuries. They do need maintenance, though.
Rain erodes the slate, and hail can break it.
The metal fasteners eventually corrode, and the slates fall off. That would cost a wad. And, don't you know, he's got some contractor telling him the goop will work just fine. Of course, this defies common sense. There is no goop smart enough to mend broken slates, seek out and replace missing nails, and do fancy sheet metal work besides.