I must have missed this question when it first came up.
My method for finding leaks in neoprene waders is different than most. I put a low pressure air hose (eg blower side of a vacuum cleaner)into the waders and tie it off at the chest opening. Turn on the vacuum and blow up the waders like a ballon. Spray the waders with soapy water and look for bubbles. Anywhere you get bubbles you have a leak. Mark the spots, and fix after drying the waders.
Remember use a low pressure air hose (1-3 psi)if you use this method.