I just learned a new lesson about Duravent DVL pipe that may help others. When the installer refitted my pipe, the dude left a nice scratch on the telescoping section that I wasn't going to accept. There wasn't any more on the truck, but he said that it just needed a little touchup and left me a can of StoveBrite paint. That afternoon I masked off the walls behind the pipe and sprayed a little on the scratch. The surface paint immediately began to crinkle . Uh, oh...definitely not compatible. Now they need to come out again and replace the pipe. I emailed DuraVent about this and got a nice response right away. They wrote that StoveBrite is acetone based. About 8 years ago DuraVent switched to a water-based paint. Since then StoveBrite is no longer compatible. They recommend using Krylon BBQ black instead. PS: I've used several spray paints in the past and StoveBrite has the nastiest fumes I've met. This stuff will surely rot brain cells. Also, the nozzle orifice is too large for good spraying. Instead of a nice fan pattern the paint shoots out in a jet. So far I'm not impressed with this paint.