Hi, I am planning on setting up a basketball hoop and backboard on a 16' 4x4 treated wood post - but - I want the post to be easily removable from time to time. My plan is to dig a hole about 18" wide and about 24" deep and use fast setting concrete that hardens in about 40 minutes. (the hole would be dug in some fairly solid clay type ground, not your normal loose garden dirt) I wanted to put a shorter piece of 4x4 post temporairly in the concrete to make a hole that would fit a 4x4 post snugly. (the temporary post would be just long enough to put a level on it to insure it was vertically aligned) Question: What can I put on the temporary piece of 4x4 treated post to keep it from sticking to the concrete when it hardens so I would be able to slide it out after the concrete hardens ? I have searched the internet for ideas how to do this and someone wrapped the wood in plastic wrap then covered the plastic wrap in vaseline, someone else talked about using a spray cooking oil, but I wanted to be really sure to be on the safe side so I was asking on this forum. Thanks in advance for your help !