Originally Posted by rchrdleigh
Basically you remove the old seal, leaving about a 1 cm wide band which you use to make attaching the new seal easier. Apply the mixed adhesive and attach the new seal and let it dry.
Don't do that if the old seal is rotted/cracked/sticky. You'll be gluing to a deteriorated base. Fine for an emergency/temporary repair, but I would try and get to the base fabric if possible. Gentle heat will usually soften the old adhesive and allow you to peel the old seal off. A solvent wipe with MEK should help even out any remaining adhesive.
A large cirular ring of thin plywood or acrylic and some binder clips will hold the suit neck opening flat and make for easier positioning of the seal.
For the wrists, it's easiest to prep everything, and use something like a soda bottle to hold everything open. Position the seal over the sleeve, then fold back the portion of the seal that gets the glue. When ready, roll the seal back down over the seal, and burnish everything in place.
Not rocket science, but it's usually a one-shot deal on positioning.