If the holes are only very small, just rubbing the adhesive in can do the trick, and only need a patch for larger holes.
They usually just say "put it in the bath to find the leaks" this is easier said than done! The mat wants to float. The only way I have managed is to fill the bath (with warm water), strip off & get in with it, folding it over and checking each bit repeatedly. Marking each hole with chalk works okayish, but by the time you've identified 3 or 4 holes, it starts washing off!
McNett do a very good glue/sealer - sticks to anything. Can't recall it's name - silnet or something? Taunton Leisure sell it. A dab of that works wonders on such holes.
Be nice to the SO!
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