Originally Posted by SteamboatBORN
Depends on if its a metal or plastic zipper. Metal you do whole zipper with McNetts zip tech and plastic you can put where the zipper locks in. Also you can use vasoline in zipper lock to help seal. Wash zipper really good before you put wax on and do it often. River grit ruins them.
Great video from Kokatat about dry-suit care. https://kokatat.com/support/product-use-care
"The zipper is one of the most sensitive components of your drysuit. Treat it carefully. The most common causes of zipper leakage are failure to close the zipper firmly, or dirt in the zipper teeth or closing end.
1. Pull the zipper in a straight line, in a smooth and even motion. Avoid yanking or pulling to the side. Have another person help you if you cannot easily reach any part of the zipper. Be especially gentle in colder air and water temperatures.
2. Never force a jammed zipper. Unzip, examine the jammed point for obstruction or damage, then carefully try again. Zipping over a piece of dirt or underclothes can derail the teeth and ruin the zipper.
3. The zipper is most vulnerable to damage when you are getting in and out of your suit. Be sure the zipper is open completely, and try not to put force on the ends that could tear the zipper apart.
4. Keep sand and dirt out of the teeth and the closing end of the zipper. Clean the zipper occasionally with mild soap, water and a toothbrush. Lubricate occasionally with a light coat of paraffin, beeswax for metal tooth zippers. For plastic water tight zippers, a dab of McNett Zip Tech Semi-Solid Zipper Lubricant in the closing end improves sealing.
5. Dry suits should be stored in a clean, dry environment. Metal tooth zippers should be partially closed with the zipper slide left about 2 inches open. This will help alleviate pressure on the sealing elements. Plastic water tight zippers should be stored in the entirely closed position. Store either hanging or loosely rolled."