I used Martha Stewart's Acrylic Pearl Paint, Aquarium to paint the outside glass back of my 5.5 gallon aquarium. I used a foam roller, and the paint glided on very smoothly. The first two coats remained translucent so that light could shine through. However, I wanted to mask the filter and the heater cords, so I applied four coats so that no outside light can shine through to silhouette the workings on the backside of the fish tank. I alternated roller direction - first coat vertical strokes, second coat horizontal, etc. There are no streaks or unevenness to the color, which is beautiful, slightly iridescent and fairly true to the sample on Amazon. The paint stuck to glass without any problems and has dried to a hard finish. The effect is quite lovely and adds depth to the tank. When the fish & the tank decorations are added, it isn't immediately noticeable that the back is painted at all. I couldn't be happier with this product and give it a well-deserved 5 stars.