• Avoid use of oils and lotions because they can trap the chemicals and thereby prolong exposure.
• We recommend using a water or alcohol-based sunscreen (rather than oil-based). If your choice is between oil-based or nothing, we advocate using the sunscreen. Pepper sprayed on top of sunburn is not good.
• We also recommend minimizing skin exposure by covering up as much as possible. This can also protect you from the sun. Don't forget a hat.
• Gas masks provide the best facial protection, if properly fitted and sealed. Alternatively, goggles (with shatter-proof lenses), respirators, even a wet bandana over the nose and mouth will help.

More information on gas masks and goggles here.