part of the foundation did not set the way i wanted. so i had to rip it out again. second pour was much better. unfortunately there's stil a part which has a kind of bubbles. not sure what happened. was not able to sand them away. guess i have to try bigger tools :-)
today the whole concrete foundation received the first two coats of paint. seems a bit on the light side. might have to add a darker coat. but first i will let the whole thing dry for at least a week.