For divers who do not live in tropical places, dry suits are really important. For the sake of safety, it is just as important to maintain your dry suit carefully and there are a number of ways in which you can do that. One thing that you can do yourself is to replace the neck seal on your dry suit. Purchase a seal kit, and then you can get on with fixing up your suit. 

The first thing you need to do is to remove the old neck seal that needs replacing. There is a tape that runs around the base of the seal, which can be removed by heating it to soften the glue. One way to do this is with a hair dryer. This can take a while, and you may get bored and want to give up and play partypoker, but if you persevere you will see results. Once the glue begins to soften, you will be able to pull off the tape with a pair of long-nose pliers. 

When the tape has been removed, you can pull off the neck seal in the same way. Make the neck area of the suit as flat as possible, perhaps using cardboard to hold it taught. The old neck seal should have left a faint line where the old tape was, allowing you to see where to put the new seal. Then you need to apply the glue in a thin strip along the edge on the under side of the neck seal. Stick this to a flat, clean surface to prevent wrinkling and apply glue to the other side. While you wait for this to dry, apply another inch-wide strip of glue and then remove the neck-seal from the hard surface. 

Now you can gradually stick on the neck seal, keeping it flat. To finish off this process, apply the tape with a coat of glue on top. Make sure that during this process you do everything carefully and find some professional instructions, then you will be good to go.