I get slammed all the time for talking about stuff I do. Usually the slammer eventuallyfigures out I'm right, even if it does take some of 'em several years to get there. In the case of waxing the string loop material before installing it, I'm on your side. Wax will act as a lube and help the knots tighten up a lot better. If you use a general purpose string wax, it won't make the material so slick it'll scoot around on the serving.

Ever made a flemish bowstring? You wax it up good with a sticky wax to help keep the twists together while you're forming the loops. When I do general maintenance waxingonmy strings and string loops, I like a lubricating wax with graphite or silicone mixed in - the stuff you DON'T want to use before tying on your string loop, but is great for maintaining it after it's installed. If I intend to go out and shoot in wet conditions, I'll wax my string with a wax that's more of a waterproofer. When it comes to choosing a wax for a given application, you have take the type of wax and the additives that are in it into account.

Or you can just not worry about it and pick a general purpose string wax like BohningTexTite or BCY ML6. Good waterproofers, not ideal for some jobs but passable and certainly better than nothing.