The flex tape is decent stuff.. However.. If you apply that over Darco and the Darco is loose due to damage usually what will occur when the slide is closed is a big bunched up mess..
If the Tape is adhered to the wood surface and can't move when it bears the weight of the slide over the wear bar then it may work well.
My solution with UHMW is a permanent repair.. If i had damage in another section of the bottom Darco cover I would install UHMW for that repair as well.
Some have had great success with tape.. I did not.. One operation of the slide and the tape I used.. which was as sticky as Eternabond simply bunched up the Darco and made the issue worse
.. hence the UHMW repair came into play..