Better be carefull! I used a rubberized undercoating on my carpets. With the sun warming up the carpets the backing stuck the the floor. Made for a hell of a clean up. I would put down a small section to make sure it doesn't happen to this product. Good luck and keep us posted on how it works out.
There are over a dozen people over on clubsearay.com who have done this and so far they love it and have no issues. I think the longest so far is 3 years that the Plasti Dip has been the carpets and it is still holding up well, even when rolled up and stored.
Believe me, I wouldn't be the first to try this out!!