My suit was fixed at a dive site once by a fellow who said he preferred a contact cement from his local hardware store over the dive industry specific stuff, as an American he didn't have access to Cad Tire or Home Hardware.
I used to use contact cement in my job decades ago and there is a big difference between retail contact cement and heavy duty stuff, which can sometimes be found in retail stores. I decided to buy several types and compare.
To compare I took an old bicycle inner tube (ask for the old ones at a bike shop) and cut 1x2" pieces to test glue. I carefully cleaned the pieces with acetone and sanded them making sure not to touch the prepared surfaces and I tried three cements. I scoured Canadian Tire and Home Hardware for glues and ended up with a Lepage one, a non-flammable kind, and some heavy duty stuff I got from a rubber supply store in Kitchener. When finished I'd try tearing apart the pieces. They all came apart, it was a matter of which one resisted best.
The non-flammable one was the worst and the heavy duty stuff was the best.
Before doing the test I used some heavy duty retail stuff on my seals and a couple of friends. They've been for hundreds of dives and are still fine.
When doing seams I'll finish it off by masking a 1/4" strip along the edge of the seal with masking tape, then apply a mixture of aquaseal thinned with some Cotol or Acetone, remove the tape before the Aquaseal dries and if you like a cleaner finish dust the glue, when tacky, with a little talc to give it a matte finish.
One more piece of advice. I use two layers of aluminum foil, shiny side down, on the Aquaseal tube before putting the cap on. It seems to keep Aquaseal fresh for months. Without it I'd find most of the tube solid after a month of two.
