Your trust in the craftsman is pleasing, and I do not want to doubt it. That will surely be right ....
What surprises me, however, is: if the roller leaves marks, something is wrong with the technique. In my opinion, such an effect should be preventable with the painting technique (cross system) or with the proper dilution of the paint.
"Bad paints" are bad because they either do not cover well or because they yellow. The idea that a paint causes streaks because it is of poor quality does not quite make sense to me ...
... let's hope for the best :)
