Mouse Free Rv Rodent Repellant - 1 Gallon Size W Spray Appliactor Coat and protect up to a 24 RV. Unused product does not expire and can be saved for your next application. Air compressor (NOT included) required for spray applicator. Simply spray the entire undercarriage of your motorhome or trailer using a compressed air hose with pressure between 80-100 PSI. The Mouse Free product works very well at preventing mice from entering your RV. It is not designed to get rid of existing mice. Bait and Trap methods must be used to reduce any existing population of mice. We recommend immediate action when evidence of rodents are found. Mice can multiply very quickly, and damage to your RV may result.