Why is my beer over-carbonated?

Typically a beer over carbonates because it is stored in too warm of a location for too long. Yeast will continue to ferment if left to its own devices. Once a beer is carbonated (typically 2 -3 weeks) make sure to move the beer to a location below 55 °F for storage. At this temperature the yeast will hibernating and stop creating CO2.

Other possible causes are either too much priming sugar was added and/or the beer was bottled before fermentation was fully completed. In order to ensure a homogeneous mixture of your beer and your priming solution one can use a sanitized stainless steel stirring spoon to gently (careful not to add oxygen) mix the beer and priming solution together.