Good primer but its coverage is not something amazing. Don't think that you can cover a dark or bad wall with just one coat and magically make it white.

I bought it because I wanted to paint rooms with dark colors (blue, dark green, dark brown - don't ask, that's how I bought the building...) and it took 4 to 5 coats of paint to cover them with white. As soon as I painted one room, I bought the primer hoping it would reduce the volume and cost of my work. Moving on to the next room, even with one coat of this primer, I still needed 3 coats of paint. In the remaining rooms, I applied two coats of primer and then needed two coats of paint. It didn't make a huge difference in the total number of coats that needed to be applied, maybe in some cases one less coat of paint on very dark surfaces.

Where it really pays off is when the paint is expensive. In my case, where I had bought a very expensive paint, it significantly reduced the cost of painting.

Good primer but its coverage is not something amazing. Don't think that you can cover a dark or bad wall with just one coat and magically make it white.

I bought it because I wanted to paint rooms with dark colors (blue, dark green, dark brown - don't ask, that's how I bought the building...) and they needed 4 to 5 coats of paint to be covered with white. As soon as I painted one room, I bought the primer hoping it would reduce the volume and cost of my work. Moving on to the next room, even with one coat of this primer, I still needed 3 coats of paint. In the remaining rooms, I applied two coats of primer and then two coats of paint. It didn't make a significant difference in the total number of coats that needed to be applied, maybe in some cases one less coat of paint on very dark substrates.

Where it really pays off is when the paint is expensive. In my case, where I had bought a very expensive paint, it significantly reduced the cost of painting.