Mike Robertson If you are travelling with your guitar in the car, keep it in the heated part with you. When you get to your destination (heated, I presume) do not immediately fling your case open if the guitar case is cold to the touch. This is especially true if the guitar has travelled in the trunk or been left in an unheated car. Leave the case closed but pop open the latches. This will allow the warm air to slowly enter the guitar case and warm your instrument. If the guitar case is quite cold give it upwards of fifteen minutes. Although I have never seen it (but strangely would like to but not on my guitar)opening a cold guitar case in a warm room can cause immediate and unstoppable finish checking as the wood expands faster than the finish.