OK that's what I've done in the past but wasn't sure if could get by with using only one type of surfacer/sealer instead of the two like I have been doing, thought it might be cheaper for one.

Also is it necessary to clear coat? What are the advantages or disadvantages to clearing? Like I said before, I'm going to color sand. Will the finish be better color sanding and buffing clear or no clear and color sanding and buffing?