Thank you for commenting @see.feel.write! I also had not really touched watercolour for a long time when I started to use colour again (after having done only black & white for very long) and acrylic was the last I used. But I had a lot of ideas of what I wanted to obtain with it and it surprisingly worked pretty ok, now after a few years there was and there's still indeed a lot more to learn.
Masking fluid is great ;)
Thanks again!