Originally Posted by chewy
Silicone mould release spray is what the RNLI give to its stations.
Blocks of Beeswax work, you need to rub it into the zip itself. We also get told if you need to clean your zip rub a bar of soap on it in the same way you would beeswax. Whilst your at sea it'll desolve and clean your zip.
If you've been careful your neck seal should be ok. I think its just the rough gits who knack them.
Be careful not to get silicone on the material part of the suit (the part other than the zipper.) The silicone will permeate the material, and make future repairs about impossible. I'd suggest the wax.
Diving drysuits have their neckseals trimmed as part of the fitting. Won't be a problem. Take a close look at the edge as you stretch it, and make sure there aren't any partial/stray cuts that leave a slit in the material. If there are trim them off (the initial cut will cause the seal to tear.)