The Ortiz routine referenced above is "Time and Again", Cardshark
, pg 85.
Ortiz does state that resealing methods have been "extensively researched by chart cheats" since it is "standard priactice to reseal the deck to make it look brand-new" after marking the deck. Steve Forte confirms this in his remarkable Casino Game Protection
. He writes: "It's well known that getting to a sealed deck is quite easy, despite the many tamper proof seals and wrappers promoted by the manufacturers." (pg 464) While he doesn't go into detail on exactly how to reseal the deck, he does describe several tells on page 498.
This company: http://www.showplacemagic.com/
used to offer a deck resealing kit, complete with shrink wrap cellophane and realistic looking deck seals back in the early 90's (also sold through "he who must not be named's" company).
I used to just take a pen knife, pry open the cellophane on the bottom of the short side, slide the box partially out, pry open the bottom of the box, replace/stack the deck, seal the box with white glue, refold the plastic and gently heat with an iron. Worked like a charm (as long as I didn't overheat the plastic) since it wasn't coming under really close scrutiny. If you can't get the heat just right, Ortiz' method of sealing the plastic would seem to be the way to go.
For a while USPCC construction was so shoddy, I had a couple of the deck box bottoms already practically falling apart, which made things quite easy.