CHO-SHIELD primer is an air-drying liquid coating for enhancing the adhesion of CHOSHIELD 2000 series electrically conductive coatings and CHOBOND 2165 to chemically treated aluminum, and most composite surfaces. Using CHO-SHIELD 1091 primer prior to application of the CHO-SHIELD 2000 series coatings CHO-BOND 2165 sealant ensures optimal adhesion to the substrate eliminating the possibility of re-work due to adhesion issues.