Midwest Homebrewing and Winemaking Supplies Bottle Seal Wax Beads, Burgundy

I will be using the was to seal our 2nd year of olive oil. Do I just dip the corked bottle neck into the wax? Do I have to worry about the cork com

How does this wax come off the bottles?. i want to reuse bottles and i dont want a bunch of was residue left on them.

How many bottles of wine would this do?