The topic is spray painting tips, so lets talk about that. When a can of
spray paint goes empty and the tip is still working, transfer it to the
fresh can and continute to use it. Drop the unused spray tip in your tool
box. Eventually, you will develop a small cache of new tips, so when one
DOES plug up you just switch tips and go on painting.

If your spray can runs out of paint before it runs out of pressure, save it
for cleaning the tips at the end of the spray job.

When you are getting ready to use a can of spray paint, it needs to by mixed
by shaking. If you hold it under the faucet, in a stream of running hot
water while you shake it, it will work better. The heat thins the paint
and increases the can pressure. Don't put it in a pot of water on the
stove, though. A friend of mine did that, and blew the can right through
his ceiling.