Here is my quick step by step guide to reproofing Goretex Dry suits or Cags. When you get a new Dry suit or any outer shell garment for that matter, it will have a DWR coating on the fabric. This coating helps to repel water by beading it on the surface. With use over time this coating will wear off and the fabric will start to "wet out". It will still be waterproof but its performance and breath-ability will be greatly reduced. So it is necessary to give you kit some maintenance now and again, to keep it at its best.
I like to wash and reproof my dry suit about once every season depending on how much use it is getting. Below are the steps I take to get it back to life. 

*Note: This is the method I use and find effective. But please check with manufactures guidelines and instructions before treating your expensive garment!

I did  my first crossing of the North Channel in 2013 when I piggy-backed on a group trip over on a sunny day in June. I don't know how long it took - probably about 6 hours or more. Ever since I have been wanting to go back and have a proper attempt - solo and as fast as possible.