promote adhesion
Frankly, I don't see the problem. According to this document, the wash primer will promote adhesion. Nevertheless, let the painter know what you used. Better yet, take the bottle with you.
Barry
A. Wash primers are water-thin coatings of phosphoric acid in solutions of vinyl butyral resin, alcohol and other ingredients. They are generally applied to give a dry film thickness of 0.3-0.5 mils (8-13 microns). The purpose of wash primers is to passivate steel and galvanized surfaces before applying a full bodied primer. Their functions are to passivate the surface and temporarily provide corrosion resistance, and they are used to provide an adhesive base for the next coating. Sometimes, wash primers are also applied to aluminum and other metals to enhance adhesion of the next coats of paint. When treating aluminum and other difficult-to-paint metals, wash primers are often specially formulated so that there is no excess un-reacted acid on the surface after is has been applied.