I make Custom Leather holsters as a side-gig.........and i have to say and i really hope everyone takes to this to heart and their wallet too.
NEVER spray ANYTHING on ANY leather holster, NEVER put it in water, NEVER USE ANY LUBRICANT!!!!!!!!!! EVER!
i have seen hundreds of $70.00 + holsters DESTROYED by doing this.
there are only 2 ways to properly wear a holster.........
#1 WEAR IT! with the gun inside! constantly, it will stretch on its own after a day or two, draw and reholster often *make sure the weapon is unloaded while doing so* after 2-3 days it will fit snug.
#2 wrap the gun in wax paper, shiney side OUT, and wear it for 5 hours, the holster will suck up the wax and become easier to use.
those are the only ways to do it without doing damage to the holster. oils, waters, lubricants will loosen the holster too much and destroy the inside..........every see a leather holster where the inside is flakey and leaves deposits all over your weapon? that is caused by POOR holster stretching. at the end of a propper fit the holster interior should look like it did the day you took it out of the package
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hope this helps!