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This is the type of wax that came with my new suit, so I figure its probably OK with the manufacturer. It goes on easy, but the sticks break apart easily, too. Nevertheless, its easy to goop up the zipper with a chunk of wax.
Its a little more of a hassle than not using one, but it seems to improve the seal of my neoprene neck seal. It hasnt completely prevented air "burping" out of the suit, but I have been a bit dryer inside. It gets folded over sometimes when trying to put it on, but not impossible to straighten out and get the neck seal situated, as long as Im not too hot or rushed. Not sure if it was worth the expense, but I guess Id rather try this for a while instead of sending my suit back to have the neck seal adjusted and risk getting it too tight.