I have had the same problem with scalecoat. Once you add thinner, it has a very short shelf life.
Roy J Meissner ----- Original Message ----- From: Lynn Ray To: S-Scale@yahoogroups.com Sent: Saturday, April 07, 2012 6:25 AM Subject: {S-Scale List} Re: Paints & brushes-air and otherwise I have experienced Scalecoat setting up in the bottle after mixing with thinner. A few years ago I painted some How Ordinary scale GP units in the T&P Swamp Holly Orange and Black for a local hobby dealer. After mixing the color I added thinner before spraying. About 10 days later after assembling the locomotives I needed to do some slight touchup with the red sable. When I opened the bottle the paint was gelled. It seemed as though the thinner was a catalyst that had cured the paint. At the time I did not investigate more thoroughly. Lynn Ray