Torch in the dark room worked a treat for me 👍🏻 I was doubtful as I have heavy rubber ones but found the pin hole straight away and repaired using self adhesive ‘scab’ inner tube patches, fingers crossed it’s done the trick
Easiest way to find leaks is none of these. Fill tub with water, put waders in tub making sure to keep some air in them. Submerge and look for air bubbles. Thought everyone knew this.