You shouldn't go for spray at all, if you're thinking of peeling it off one day. That's also what I meant by laying it right. I did this with a few of my kites. I found that if I DON'T thin it down with anything, I can dip the nose, and it will stay on but won't penetrate the webbing so much as I cannot peel most of it, if not all of it, off.
This is a kite altering process, never the less, and should be regarded as such. It's my personal opinion that if you don't want to take the risk of changing the way the kite was initially built, even in the slightest, you should not engage in this method. Results may be irreversible.