Abstract: To provide metal surface treatment agents with excellent adhesion to metal surfaces. A metal surface treatment agent comprising first silane compound containing a functional group that chemically bonds to the metal surface and a functional group that chemically bonds to the coating film, second silane compound containing a functional group that chemically bonds to the metal surface and a functional group that provides rust inhibiting properties to the metal, and a solvent mixture of organic solvent and water.

Abstract: A vehicle protected with a peelable protective film having excellent moisture impermeability and moderate adhesion over a long period of time is provided. The vehicle includes a metal structure, a paint film formed on the metal structure, and a peelable protective film formed on the paint film, and the peelable protective film contains a resin and plate-like metal fillers.

Abstract: A flying object includes: a flying object body; a blade that enables the flying object body to fly; a paint ejection mechanism that ejects paint in a first direction; and a fluid ejection mechanism that ejects a fluid in a second direction differing from the first direction by 90 degrees or more.