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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! If it is getting hot enough to damage the plastic liner, the light is either too high wattage or is staying on too long. Do you have the OEM bulbs in there or did you replace them with a generic one from a hardware store? Do you know the wattage? As for the liner damage, that won't hurt anything and won't allow air to leak, it is just not aesthetically appealing.