No, my EC spread within the first two months to parts of my lips not affected previously. I hadn't realized it until many months later. However the buildup did decrease as time went on -- very slowly. But it did appear to get better.
At this point it took only three months using constant moisture for my lips to look fairly normal on a daily basis. I don't even need to put cream on the outer lips anymore, just the inner lips where they meet, so my outer lips for the majority of time rarely build up skin anymore. If I were to leave my lips alone today again, the buildup would be much lighter than how it was before when I left them alone.