I found a place online that mixes custom base coat for pretty much any vehicle color. They also sell clear coat and blender in a spray can. I wonder if anybody here has used blender in a spray can and if the result was decent. This is not about hoping to get either a 100% color match or a factory-like finish. The repair would be on an old daily driver, for example, to touch up a corner on the fender or bumper. My main concern would be whether or not the blender can actually blend with the factory clear coat of a 20-year-old vehicle. I know I can contact them, but I prefer user experience of vendor advice.
https://www.paintscratch.com/cgi-bin/order-form.cgi
https://www.paintscratch.com/cgi-bin/order-form.cgi