[Danr55]

Skully, When you shut off the engine, you stop all the cooling processes, but you don't stop the engine heat immediately. Sounds like you've simply had too much coolant in the engine to begin with. A small amout of coolant puked out of the overflow is normal. Leave it be. Don't add any more. It should be fine. The only time you need to worry is if the engine temp goes too high while you're driving.

Try using distilled water and water wetter. Perhaps a small amount of water pump lubricant. Leave the green stuff in the jug.