Ultra Ever-Dry was the 1st of these products I recall reading about a while back. It's website says for industrial use only , not for personal use, in spite of the personal use nature of much of their demo video.
The comments after this above-linked u-tube video mention the Rustoleum product label says "not for use on electronics and clothing" and others mention there is a grayish film and that it washes or wears off too quickly, such as boots that lost their protection in part of a day walking through wet grass.
These are very intriguing products but I'd suggest take care to not get too carried away with demos of just-sprayed items. They apparently require a bottom and top coating and are pretty spendy . Perhaps the life of the protective effects will be improved if that really is an issue.
That said , I'd love to try a sample.