Got the graphite spray this morning. It works, 3 fine coats and instead of the to parts touching at the joints i now have a 1 inch gap. Also used it on a Fibreglass rod that needed a bit of TLC and the results the same. Just going to let it dry properly overnight before a bit of candle wax goes on. In the 75ml spray can i have found it just has enough paint to build up 3 spigot joints. Maybe a little more as my can splattered now and then so had to wipe off 1 coat and start again.
Thank for telling me about this stuff and saving me the cost of a rod builder. OK, it will wear down again but a £8.99 that's fine.