CHO-SHIELD 1091 Primer


SKU: CX50011091 0000 Categories: ,


CHO-SHIELD 1091 is an air drying, adhesion promoter for conductive polyurethane coatings

CHO-SHIELD 1091 Technical Data Sheet


Value Proposition

CHO-SHIELD 1091 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.


Properties Specifications Test Method
Viscosity at 77°F (27°C), centipoises 5 N/A
Color Red Clear
Specific Gravity 0.8 ASTM D792
Flash Point 52 °F (11 °C) N/A
Continuous Use Temperature - 52 °C to 82 °C (-67 °F to 180 °F) N/A
Elevated Temperature Cure Cycle 30 min. @ 88 °C (190 °F) N/A
Room Temperature Cure 1 hr. N/A
Working Life N/A N/A
Shelf Life, unopened, from Date of Manufacture 9 months at 25°C (77°F) N/A
Minimum thickness recommended 0.0001 in (0.00254 mm) N/A
Maximum thickness recommended 0.0005 in (0.01270 mm) N/A
Volatile Organic Content (VOC) 800 g/l Calculated


  • Easy application
  • Quick drying
  • One component
  • Red tint enhances visual inspection
For best bonding results, use the following application procedure: Thoroughly clean the chemically treated surface such as MIL-DTL-5541, Type II, Class 3 chromate conversion with an appropriate solvent such as methyl ethyl ketone (MEK), isopropyl alcohol (IPA), etc. Air-dry for 15 minutes. Wet a lint-free cotton cloth with CHO-SHIELD 1091 primer. Apply primer to the surface in horizontal and vertical strokes. Keep the surface wet at all times. After the entire surface has been coated, air-dry at room temperature for 1 hour or at 190°F (88°C) for 30 minutes. Note: If primed surfaces are not coated within 4 hours of the primer application, repeat the cleaning and primer application procedures, again, before coating. To eliminate the risk of an increase in surface resistance, only a light coating of the primer is recommended.