perhaps if you told a bit more of the problems with the seath in question, then the guys who have years of seath making behind them , might better be able to answer your question?.....
I do the same as Mike says,,,,and it seems to work for me,,,so far...
If in the future one of my sheaths comes back with the stitching tore, I guess I would just re-do the stitches again,,,
http://eastof29.tripod.com/daqotahforge2/id29.html
The idea of covering the stitches with something to protect them,,,is interesting,,,But I have not read from anyone here yet that this needs to be done...