Well when this thread started I placed a bottle of Quik Detailer upside down on my wood desk right here in front of me after making sure the spray head was tight against the bottle and not a leak out of it. Left it upside down for a couple of day and still nothing, so make sure the spray caps are tight against the bottle and then try to always store your bottles in an upright position.
If you're having any problems with leaking seals then the BEST thing to do is to fill out the forum I've linked to below where your concerns, issues and feedback are tracked in a database.
Your posts about this issue or any issue on this forum are NOT tracked in any database that management will see.
The above link can also be found under "Site Navigation" in the third column of the forum homepage.