I've noticed that whenever my bottle of PGP or TTG gets knocked over, the microsprayer tends to rotate a few degrees and loosen up the base. Not referring to a drop off a cabinet of a few feet, but more like simple tipping over of the bottle. As a result, the sealant leaks out of the base of the sprayer. Fortunately, I've caught it as soon as it happens and not much has leaked out.
Yesterday, my cat tipped my bottle of UPGP over yesterday, and when I went to go grab it for a detail today, I noticed that there was only about 1/3rd of the bottle left. Quite unfortunate for a $70 bottle of sealant.

I am certainly looking forward to the Ultima sprayer upgrade since this never happens with any of my other spray bottles. Heck, maybe i'll throw some blue loctite on the threads of my next bottle
Dave