When you find the leak, I HIGHLY recommend thinning the Aquaseal or Goop with toluene. I will never do it any other way again. When you use it full strength, you always have to worry about it running, it takes 8 hrs to dry, it look globby and its just a general pain. When you thin it, about 2 parts aquaseal to one part toluene, you can brush it on and it will soak right in and dry to tacky in about an hour. Sometimes, it soaks in so much, you can't tell where you put it but you know its there, because you just put it there. Deep penetration. You then add another coat or two.
You have to make sure, like mixing epoxy, that you mix it very well. I have small cups for mixing epoxy when making rods and those worked perfect. When it dries, you can peel the aqualseal off and use it over.
I picked up a huge can of toluene at Home Depot. I wish they sold it in smaller quantity. Its harmful, so wear a mask. When you smell it, you will recognize it. Smells like Head cement. Cheap small bushes, also picked up a Home Depot.
This year, I turned my waders inside out (always do it inside out, looks better) and covered all the seams in the booties, including the ring around the leg where it joins (powder it or make darn sure its really dry before turning back in because it will stick together). It took about two tubes of Aquaseal but those puppies are bone dry now. Well worth the effort.