Outdoor area has screed - How to seal edge joints when there is no skirting?

If coatings are rubbery, they are applied too thickly or would have needed several thin coats. But well, if you just pour out the can, that was probably a different tactic

you are probably right, I did work poorly indeed. I will get some more soon and fix the spots. What I like now especially is that the room can be easily swept with a broom with soft bristles along with the floor.

I bought the paint locally from a resident company (Firma REMEI).