I used some of the Gear-Aid Tenacious Tape on my breathable waders once, didn't last.
Fine for temporary repairs, but Aqua-Seal is my goto for waterproof gear.
On small holes, a little dab over the hole is all that's usually required. On larger holes I cut a patch and use the Aqua-Seal as the glue. It is also excellent for painting a wear layer over seams that are leaking, or in danger of leaking. particularly inside thigh seams. I also use it for repairing cracks on my leather hiking boots. My boots usually start cracking at the sole junction. If I clean & repair the cracks, I can get a season or two more out of them.
Hunt'nFish