Advice required about Hole repair kits for porcelain

[Old Mod]

Yes, that’s one of the vids I’ve seen, but they don’t have any clips dealing with a wall tile repair.... only horizontal repairs which is a bit suspect! Does the wax run out of the hole before it cools and sets???

No, dries instantly, and I mean instantly. Walls or floors makes no difference.
Biggest problem with it is that the chrome plate comes off heater tip exposing brass underside, this can contaminate the resin and make it dirty, thus changing its colour.