if its a membrane type suit and the glue is getting old you can carefully pull the tape or the old seal usually just stretches and comes loose ,,,make sure that all the old tape and seal and glue are removed ,i use a football for the neck and old plastic cola bottles to go inside the cuffs to keep the mating sufaces apart and to get the new glue on evenly ,, once the glue and the new seal has been stuck on i then go around on a hard surface and press down hard to make sure all the mating surfaces are hard together ,,then do same with the tape ,,,you just need to take your time and plan the glueing stage so you dont finish up with large left over bits that you cant stick down or have then to stretch ,,,,another tip is to mark the new seal with chalk at every quarter then you can guess better as you go around and stick it down .,,,you can get seals in a kit form from most diving /scuba shops ,
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