An apparatus for painting a surface, having an absorbent paint applicator containing paint and contacting the surface; a tube filled with paint and connected to the applicator; and a metering device for incrementally metering paint onto the applicator from the tube. A latch disposed in the housing and is configured to retain a well logging instrument in a first longitudinal position inside the pipe string. The present invention also includes a continuous belt element formed as a loop and continuously rotatable in a first plane of rotation around the first pivotable body element, the first pivot mechanism and the second pivotable body element.