Two things that you Must Do when using Aerosol Spray Paints
Have you ever had this happen? Your mailbox is starting to look dull and weathered. It could use a fresh coat of paint. So you decide to paint it the same color as your window shutters. You purchase a can of custom matched aerosol spray paint and you paint the mailbox. It looks great, a perfect match with the window shutters. After using the aerosol spray paint, you replace the cap on the can and put it in your storage room.
A couple of months later, you want to paint an outdoor flower pot the same color as the mailbox. You get the can of aerosol spray paint that you used on the mailbox and you press the spray nozzle and nothing comes out. Even after digging at the opening of the spray nozzle with a paperclip, the can will still not spray. So you end up throwing away a half of can of spray paint and you still need your flower pot painted.
Or maybe it did spray, but now the color does not match the mailbox and shutters. It had changed colors or something. It might have even looked like the right color at first, but changed color as you used it. Again, you end up discarding the half-filled can of...