Just keep in mind that you must disclose the fact that you sprayed them when you sell them. If they had to be sprayed to prevent leaks, I'd probably label them as having "bad PUL." I've never used this spray, but I've heard that it will eventually wash out. I'd be pretty upset to buy diapers only to have them go all leaky on me after a few washes.
This^ I would think the spray on waterproofing would also offgas a fair amount and any potential purchaser would want to know that in advance.