Re: Leftover Paint Storage
I disagree with storing the can upside down. Unless the lid and top of the can have been perfectly cleaned, it will likely leak. Secondly, now you've got all the solids stuck to the lid, which will create even more mess and problems.
When painting, ALWAYS clean the rim of the can and lid each time the can is opened and used. Any paint here and the lid will be virtually impossible to seal or remove later. And the key to storing paint is to keep it in a cool, dry place away from temperature extremes or wild fluctuations. Heating and cooling cause condensation, which causes the lid to rust and weld itself to the can rim.
Lastly, if this is an often used brand and color, write down the paint brand, base type, and the paint code on a 3x5 index card, then apply a good, even coat of paint on the end. Store this in a safe place. This will be all you'll need on your next trip to the paint store for the technician to mix up another batch AND test it against the original color. Otherwise, preserving the can label and paint code with a good sized paint chip on the lid will suffice.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!