I use a Paasche paint booth that’s 22 in. wide and 18 in. tall at the face. That’s a little small for painting with a rattle can (larger spray pattern and makes
a mess in the paint booth), but I use an airbrush for most painting, so it’s not a problem. MR published plans for building a paint booth that’s larger than mine in the August 1983 issue, if you want to build your own.
