Just use McNett Blackwitch neoprene glue for this. Very easy, apply a little glue, wait a short while (until glue becomes "matte"); press together ... done
think its best to wait a couple hours (night) before swimming
(removed my comment to use tape to fixate as this seems not needed, and could even cause more damage!)

Aquaseal

https://gearaid.com/collections/aquaseal/

Neoprene glue is a contact cement.

Put it on both surfaces, let it dry to the touch then put the two pieces together when you're ready.

Don't wait a day for it to dry before putting surfaces together.

A bunch of good YouTube videos on this. The old Trisports had a good one.

I wouldn’t use the advice above where it was suggested to apply tape after the glue. It shouldn’t be necessary, and I can imagine the tape sticking to the inevitable little bit of glue that will protrude.

Thanks everyone for the advice- very helpful.

On seams that are sewn I will also resew them by hand as well. Recently sewed up about a 10-inch opening down a seam. Took me and my minimal sewing capabilities quite awhile, but its still holding up.

Yes, I have fixed lot of tears and holes in wetsuit. Super easy. If it is a hole you are going to need some stronger upholstery thread which will stand up to the test of time. The following is what I use for that. Stitch it up. Then apply black neoprene cement on the threads. If it is a rip just fill in the rip with a little cement and press the ends together. I like to use a little masking tape to hold the pressure and just leave it there for a day or so. The following cement will do a bang-up job on the suit.

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While I agree that the tape may not be necessary, it will not be hard to remove from areas it comes in contact with neoprene glue.

It will be just like removing tape from the non-glued surface. I know this seems counter intuitive, but I've done it.

As mentioned, it's a contact cement, and bonds together. Also helps to have some of the heat tape the wetsuit companies use. I'll be happy to send you some w directions, just PM me your details.

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Karen ST Concierge