Its anti-inflammatory and pain-relieving properties, coupled with its natural cooling sensation, make eucalyptus oil ideal for soothing a painful sunburn. Antibacterial properties also protect the skin from infection.Fill a two-ounce spray bottle with purified water. Add two to four drops of eucalyptus oil and one teaspoon of pure aloe vera gel, which acts as a natural emulsifier. Shake well and spray on skin for relief. This also makes for a refreshing spray that can cool you down on a hot summer day.