And this is how it looks coming out of the mold. It actually dried a bit longer than I wanted to this time.
I had to knock out the plugs with a hammer. The real problem is that the plugs tend to float and too much concrete gets under them.
So, a bit of cleanup is necessary!
I use some old dental picks to scrape off the cement. Most of the time it just flakes off, but I do have to spend a bit of time with some stubborn pieces, so I get a lot of powder.
I finish it off with a wet toothbrush.