As far as p-tex repairs not holding wax, that is true. p-tex candles are extruded, while good quality base material is sintered.
Further, by heating, you do destroy some of the wax holding capability.
Oddly enough, I never seem to have a problem with my reapirs holding. One thing I learned long ago was that filing ptex repairs is better than scraping. this puts less strain on the edges of the patch.
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