ᐅ Which type of joint compound is suitable for settlement cracks or small imperfections in interior plaster?

As the title suggests, which type of filler should I use to repair settlement cracks and small imperfections in the interior plaster? The interior plaster is Q3 and simply painted white. Should I use a filler and surface filler or UNIFLOTT FINISH?

First apply primer and then Uniflott. That’s how it’s done!

If it has already been painted, you don't need a primer.
I would say you can use either. Any type of gypsum filler will also work.