I concur with the opinion that over care is probably a bad thing to do on any tattoo. Most of the time when I have a client ask me what to put on it, I just tell them the best course of action is to leave it be. If your tattoo takes longer than a week to heal, and it starts to fester or hurt really bad, or if you feel sick, you need to go to the ER right away.
I was a Hospital Corpsman in the US Navy. I served with Marines and saw many tattoos that would get infected due to improper aftercare. Something that you want to be careful of is putting anything on it that has petroleum in it--VASOLINE IS BAD!!!!! and it is usually full of crap that is left in the jar by the last person who used it. Tubes or foils of bacitracin or A & D Ointment are okay, but use it very sparingly. I don't even give clients the stuff anymore and apply it to the skin right after the tattoo is done.
Being this way with aftercare instructions to my clients such as these has caused a complete drop off in aftercare related infection in tattoos I've done over the last several years.
BTW, I also have a vegvisir. Are you of viking heritage?