Algae
There's no doubt about it, drysuits require a great deal more maintenance than wetsuits. However, much of it is well within the capabilities of a home handyman with readily available materials and tools. The following guide should give some idea of what is involved in owning a drysuit, although there is no need for you to do these things yourself if you don't want to!
Zipper
The waterproof zipper of a drysuit is a really neat device. It is quite different from a normal clothing zipper, and exactly how it works is not obvious. Here are some close-ups of an old zipper that I cut up:
More: Zippers, Seals, Valves & Maintenance ...