User blog comment:Luffayking12/Ace after the 2 year timeskip/@comment-5896530-20130127202556/@comment-3425840-20130128235703

According to Rayleigh, every living being has dormant observation and armament haki, so yes Ace also has them but whether he was able to yield them is another thing. He never showed any sign of using them. When he fought Smoker, if he had armament he could and should have used it. Also against Akainu, Aokiji, Blackbeard and Magellan, specially as he was handcuffed with sea stone and could not use mera mera abilities at that point.

Thus I think he did not have armament at a usable level.