404 Corrosion Proof Base Coat
Karnak 404 Corrosion Proof is a self–priming, modified acrylic coating designed to go over sound and properly prepared rusty metal surfaces to prevent the development of new rust.
404 Corrosion Proof is recommended for use as an elastomeric coating over properly prepared metal roofing including metal that is sound but showing surface rust. This coating imparts excellent corrosion resistance, adhesion, and low temperature flexibility. The coating is intended for use as a base coat on new metal and lightly rusted metal roof surfaces that have been properly cleaned prior to the application of 535QS Enviro-Lastic, 501 Elasto-Brite, or 529 Renu-White topcoats. New metal surfaces must be allowed to age 30 days before coating.
Surfaces to be coated should be dry, clean, and free of dirt, dust, grease, oil and loose rust or coating. Power wash surfaces with 799 Wash-N-Prep Roof Cleaner or TSP substitute and water. Wash roof surfaces with a minimum of 2000 psi. taking all necessary precautions to avoid damage to the roof system. Seal fasteners, seam and flashings with 550 Patch-N-Go Fleece self-sealing tape or Resat-Mat and Karna-Flex WB or appropriate sealants or caulking materials.
Mix lightly prior to application of the coating. 404 Corrosion Proof may be applied by brush, spray equipment or roller. For applications in higher temperatures (above 90 °F) Karnak recommends application in multiple thin coats to prevent trapped moisture problems. Commencement of work by the contractor implies his approval of the deck surface.
Utilize a standard paint spray pump or airless spray pump. Equipment manufacturer should be consulted for more complete information. Spray application should be done with a 50% over-spray pattern.
Apply 404 Corrosion Proof over the surface at the rate of 1.5 gallons per 100 sq. ft. Allow to dry 12 hours then apply the selected finish coating. The total dry mil thickness of 404 Corrosion Proof and finish coating should be 20 to 24 mils. Coverage will vary depending on the surface to be coated.
CARE OF TOOLS
While material is still wet, tools may be cleaned with water. Dry coating can be cleaned with Karna-Klean or xylene or similar solvent, taking the necessary precautions when handling flammable materials.
- Weight Per Gallon: 10.0 lbs.
- Solids By Weight: 67%
- Solids by Volume: 48%
- Color: White
- Hardness Shore A: 70
- Elongation: 500%
- Tensile Strength: 200 PSI
- Weathering: Excellent
- VOC Content: 47 gm/L
Do not apply when rain is imminent. Coating must be dried before exposure to water. Store in a heated room and keep container covered when not in use. Do not thin. Keep out of reach of children. Avoid prolonged contact with skin. Dispose of in an environmentally safe manner. Cover air intakes during application and while drying.
COLD-PROCESS SYSTEMS AND COATING, EITHER EMULSION OR SOLVENT BASED, SHOULD ONLY BE INSTALLED ON DECKS WITH POSITIVE DRAINAGE.
PER NRCA, (NATIONAL ROOFING CONTRACTORS ASSOCIATION, “THE CRITERIA FOR JUDGING PROPER SLOPE FOR DRAINAGE IS THAT THERE BE NO EVIDENCE OF STANDING WATER ON THE DECK 48 HOURS AFTER IT STOPS RAINING.”
Available in 5 gallon pails and 55 gallon drums.
If further information is needed, contact Karnak Technical Services at 1-800-526-4236.