Bad glide on classic skis

Well,,,,,,,,,you have many respones to choose from. X-C ski waxing can
be difficult at times to figure out. It sounds like, the wax that you
put on,,,,,,,was working to start, so you where successful on that
part,,,,,,,,,,,but as with many xc races that start early, and it is
colder, the wax that you put on was working,,,,,,then as it warmed
up,,,,,,and also possibly got more humid,,,it changes. If you know
that it might warm up,,,,,,,,,,sometimes you can try and mix a warmer
with a colder. That is what makes xc skiing so challenging!