I've been waxing my road and mountain bike chains for a few years now, and have always used just paraffin wax. Typically, I leave the leftover melted wax in the heating element (an old slow cooker) for use the next time, so the wax that's in there now has been heated up and cooled off several times now.
I've noticed that early on when the chain had cooled off it was incredibly stiff with wax, whereas now it's still stiff but much less so. I'm wondering if the age or constant heating/cooling of the wax is producing a worse/different lubrication.
Should I completely replace the wax every time, or just more frequently, instead of repeatedly re-using it?