good old axel grease!
I have sprayed mine with Rustoleum and before I assemble it I put some vaseline on the threads of both pieces. Works great for me. I have a JUMP pole I built many years ago and I cannot get that unscrewed from the base even after soaking it in wd40 for days (both inside and outside and banging on a pipe wrench with a sledge hammer so you will do well to take it apart every year. I never took the bottom pipe from my base until I wanted to uprade that pole to an ASAP last year. I learned my lesson the hard way. LOL Fortunately the JUMP still works fine.
I have sprayed mine with Rustoleum and before I assemble it I put some vaseline on the threads of both pieces. Works great for me. I have a JUMP pole I built many years ago and I cannot get that unscrewed from the base even after soaking it in wd40 for days (both inside and outside and banging on a pipe wrench with a sledge hammer so you will do well to take it apart every year. I never took the bottom pipe from my base until I wanted to uprade that pole to an ASAP last year. I learned my lesson the hard way. LOL Fortunately the JUMP still works fine.
I have also tried to use light weight oil to the threads, however it never worked out!