Thirds on Scalecoat. If you read any of my other finishing posts you'll see I'm a fan. I, too, thin Scalecoat 1 to 1 with thinner. I use the Scalecoat thinner for mixing (its actually a blend of xylene and toluene) but use whatever I have on hand (lacquer thinner, xylene, VM&P naphtha) for cleanup. I've been using Scalecoat for a long, long time, starting back when it was produced by Weaver Models. In 2015 Weaver announced they were closing after 50 years. Shawn Cavaretta bought the rights to the Scalecoat name and formulary. He moved the operations to New Hampshire and is now in Nashua (about 15 miles away). I've never had delivery problems, but then my last few orders, I've just driven over and picked them up. Currently, due to the "situation", Shawn has stopped in store pickups. There are a bunch of retailers that carry Scalecoat so that is an option. By the way, I have a bottle of B&O Blue from 2008 (not a color I use very often!!!), but it still sprays beautifully.