I have watched Russell's "replacing a washed out sky with a new one" tutorial but whenever I try it the new sky does not show through well even after overlaying it. Is there another little tweak to it that I'm not doing? Thank you.
The bluesky would not show with overlay if the sky beneath it is white. If you just want to blend the blue sky in, why don't you try toggling the opacity of the blue sky and use the "Fade" effect like Russell suggested in the tutorial and see if the result works for you?