Hi All, first is it true that using Spackle on wood work that is going to be stained/polyurethaned is the best option for a filler(nail holes, etc)? Also when installing a drop ceiling what is a good amount of distance between the floor Joice and the drop ceiling for an easy installation? Would 4" be sufficient? Thanks in advance for any help regarding these questions. I just want to make sure I do it the right way.