To treat/Spray or not to Treat/Spray??

^^I'm afraid i have to disagree with you! I've been using apple guard spray on my LV bags, and so far it works like a charm!! No more water marks!!!! I highly recommend it!!! Just be careful, don't spray too much!
 
I applegarde all the vacheta leather on my bags - I'm talking every inch including the leather piping on the bags and accessories. I also take them out once a year to give them an applegarde "spa" treatment. It has kept my bags from getting the dreaded splotchy water marks but still allows it to patina gradually.