They have done some paving on the edges from Belmont to Union. I thinkk they are still going to come back and "finish" the middle of the road.
ME 131 from Belmont to Union is pretty beat up on the edges. Staggered formation would probably be difficult 30-40% of the time. The road gets better the further south and no real issues from Union to Port Clyde. It was a little cracked just after turning onto the peninsula in Thomaston, but improved quickly.
How were the road conditions at the time you RECENTLY rode?