My brother, a master painter by profession, used Opticryl on glass fiber StoTex in our bathrooms and kitchen for wiping and such. He said he wouldn't use it everywhere because, similar to a varnish, it also seals the wall. Acrylic paints are no longer vapor permeable. They resemble tiles in effect. He painted the rest of the house with StoBasic old white or StoBasic tinted according to my wife’s choice. Sto has better wall paints than the basic ones. But he said the basic is and has been distributed by Sto so that the craftsman can make a sharp price for 300m hospital corridor tenders. The paint is not bad and cheap. That’s true. Although it is at the level of DIY store brand quality, it applies very well and also covers. Karsten