Will any kind of water-proofing spray work?

[Laniemel]

Ok, I needed to get some water-proofing spray for some wicking AIO's I got off of Ebay. I'm overseas, so I'm kind of at the mercy of AAFES and all they had was Kiwi Camp Dry Heavy Duty Water Repellent. It's 13% silicone and it says effective on all breathable materials. Has anyone heard of this and do you know if it's ok? I didn't want to risk my diapers without asking everyone.

Oh yeah, another question that never got answered....when you mix up the Dixie Drops solution, how long will it last if you keep it in a spray bottle? Thanks everyone!