I wax mine and the harness after I shoot it every day and no you can not over wax your string. When I bought a bow from the PSE truck years ago the PSE rep told me if I wax my string after each time I use it it will increase the string and harness life X2 and by god he was right. That was 3 bows ago and the tip has never failed me. And at almost $100.00 for a string and cables I'm going to keep doing it.