A one-component primer for Propeller anti-fouling, based on synthetic resins, which adheres well to metal and alloys in general. Especially formulated to provide the adhesion of the anti-fouling Propeller, it can be used for all underwater metal parts which need to be protected against fouling such as propellers, shafts, flaps, etc. An improved primer which is quick drying, has good anticorrosion properties and is easy to use.