I wipe the nozzle off with a dry paper towel after each use. I stopped inverting the cans. That only helped marginally. Black seems to clog more often for me. Be careful removing the nozzle, so you don't spray yourself. You can take the nozzle off and soak it in a dixie cup of thinner, but wiping it is usually sufficient. I've only had a few cans fail over the last few years and I have 20 on my shelf.
George