How to diagnose/find pin holes in waders?

[mcfly]

Wondering if there are any tricks to finding small pin hole leaks in the waders. Today i fell and felt like I may have scraped my waders but when I checked it with my eyes it looked fine. (I wasn't wearing glasses though lol).

Anyways, later in the day my waders felt damp which I though might be sweat, but the right leg was about 30% more damp then the left and the right side is where I fell.


So the question is, how can I find if there is a pin hole so I may repair it?