Rustins Stain Blocker & Multi-Surface Primer 250ml

But almost twice the price of Kilz 3 Premium Interior Exterior. Rustins is made in the United Kingdom. It's extremely thick and dries quickly, so any of it applied has to be smoothed out immediately--if it isn't a hard glob or ridge will develop in seconds. Kilz dries quickly, too, but it's thinner and easier to work with. I bought the Rustins for a bedroom painted an extremely dark blue-green that had the paint slopped on so that the stains weren't originally visible. First I sanded with a Makita 18v jitterbug, then two thin skim coats of plaster to even up the plowed field surface--that's when numerous black stains appeared thru the white plaster. The Rustins was first applied with a roller on the large area that had numerous black stains 1/2 inch diameter and smaller, and on scattered small stains. Some still showed black and had to be coated a second, third and fourth time with a small brush. That's when I knew it was no better than Kilz. The can had a rough life with numerous brutal dents by the time I got it. The lid wasn't fully tapped close and dried flakes were on the lid when opened. A small amount of hard dried paint was in the box.