Flashing/streaking in finish

Q: When my new bar was installed, the installer damaged our new cedar floor. The GC used Scotch Brite to finely sand off the problem. When it was time to put the final coating over the damaged area he got what he described as “flashing” (streaking).

How can this be fixed?

A: Stir the finish well and don’t allow any air movement until the finish is tack dry.