Laying Peco code 55 track using caulk: problems

[videobruce]

It is important to file the end of cut rails as Tyson says and fit the joiners BEFORE placing the track in place.

Using a 'flush' type of cutters results in a decent 'cut'. Not perfect, but I will file the ends from now on to see if that helps.
Regarding placing joiners on the rail first, I have been placing the joiners on the turnouts (where I'm having the most problems). I really don't see why it would matter with flex track, if the joiner is on the piece that was just laid, or on the piece you are attaching. Only one piece has the joiners, though it seems to be easier if the piece on the layout has the joiners so the new piece can be laid with the rail sliding over the joiner vs trying to side the joiners under the existing rail.

As well as tapering the rail base

Explain. :?: