From Exit Wounds one-shot:
Originally posted by cdtm
I remember reading this old comic book teamup of Logan and Greyskin, where he claims hs couldn't penetrate his skin. Wasn't mine, read it off a friends stash as a kid.When did they retcon that for the first time?
If by Greyskin you mean Mr. Fixit, then you remember it wrong 😛
It wasn't a team-up. They tried to tear each other apart.
And Logan said he always *thought* Hulk's skin was impenetrable and that he was wrong --- as Hulk's healing factor simply repairs the damage so fast, it seems as if the cut wasn't made.
Story by Peter David, art by McFarlane. Incredible Hulk #340.
That was the first time it got retconned, but most chose to dismiss it, because it was Grey - weaker - version of Hulk. Even though Wolverine was talking in general about the Hulk and his abilities, not specifically about Fixit.