Replying to Question about materials

so last year i made a pvc rail with ideas from this cult it was prty good xcept that the wooden frame started to get oose after a couiple times and the rail was a pain to move fro mthe park to my house cus it was big and long so we were just sliding on looose rail lol, so i was at homedepot the other day and i say like i think it was "galvanized fence post" like 10' long is this any good to use? it was like unfinished metal finish like polished almost there were also painted ones and they were honestly like less than 10$ for each post can i use this to slide on?