None of my tile samples worked, I made them all with three coats, I tried 4 and 5 coats on my pots which have all turned out well except for running, especially the ancient jasper.
This first one has 5 coats, as you can see there was a lot of running but the colour is perfect.
. Hahaha this is a funny glitch no matter what I do this photo won't post upside right . . . Sorry
This one has four coats, less running colour is still okay but still some drips.
when I did the three coats it was like you said muddy all of theses were fired to cone 6, all holes and lid closed tight a