But every website I look at is says apply it directly to the thumb (skin).
Sorry if I didn't word my question correctly, I am looking to build the front of my thumb hole, for more of a snug, increase in grip, around the flat side of the thumb. Also I was under the assumption it was a tape I could leave in the ball
There are basically 3 types of tape.
1- The White grip type, you typically place this in the front of the thumbhole and yes you can leave it there (Though change it every so often because it can wear out.)
While technically putting tape in the front of the hole changes span/pitch some. Unless you just pile it in there, your not really going to notice.
You might want to look up "Tiered Taping by Joe Slowinski"
Tiered Taping is a method to adjust a thumbhole to account for the fact that a thumb gets narrow (flatter) towards the tip.
2- The Black smooth type, you typically place it in the back of the thumbhole and yes can leave it also. Use it to snug up the hole some.(Though change it every so often because it can wear out.)
Nether of these tapes are placed on the thumb itself, only in the hole
3- The Fitting tapes, like Storm Thunder tape, Turbo tape, hada patches etc. these are placed on your thumb itself not in the hole.