Man, my buddy edited a whole wedding on a TV set to vivid mode.

How old was the suit when the zipper first started showing signs of trouble, like sticky spots or tiny leaks you had to ignore? Six years is a long run for a brass or plastic zip that gets salt and grit worked into it every single dive. Once those teeth start skipping they are done, no lube or wax will bring them back. If the rest of the suit is still solid, a shop can swap the zipper but it costs real money and you lose the suit for weeks. If the seals and seams are also aging out, put that repair money toward a new suit instead. Chasing one part on a worn out shell just means the next failure is waiting on your next dive.

My buddy Dave in Toledo had the exact same thing happen with his pizza dough last winter. He was using a stand mixer on speed 4 for like 8 minutes straight and wondering why the crust came out like a cracker every single time. He finally just started mixing it for 2 minutes and letting it sit, and now his neighbors are begging him to open a shop. It's wild how much damage you can do just by being too hands on with the stuff.