Hi beergut100
Yes you should re-prime because basically you are otherwise using a totally dry atty when you start re-using it!
I would just put a drop or two on the atty bridge (metal wire wool looking thing ha-ha!) and you are good to go! Other than that when you put a cartridge on leave it a while for it to wick onto the bridge!
Everyone will tell you different things so it up to what you find best in end, But I just use attys (901) until they start to deteriorate in flavour and vapour and toss them a way!
You will be surprised when you been suffering along with a old one, then change for a fresh atty what the difference is!
Attys = disposable items! Bound to get loads of dissagreements ha-ha!