Sherwin-Williams Kem-Kromik 671 (formerly known as Steel Spec M671) is a conventional quick drying alkyd undercoat / tie coat. A high quality undercoat / tie coat developed for marine use on above waterline areas, also suitable for normal interior and exterior use. May also be used as a wood primer for interior or exterior use.


Endorsements: BS 476-7:1997 - Surface Spread of Flame Material - for details of substrate/scheme, consult Sherwin-Williams.

Average Drying Times: Kem-Kromik 671's quick drying properties allow it to be touch dry in 1.5 hours, recoat dry in 4 hours, and dry to handle in 16 hours (at 23 degrees).

Surface Preparation: Ensure surfaces to be coated are clean, dry and free from all surface contamination.

Application Conditions & Overcoating: In conditions of high relative humidity, ie 80-85% good ventilation conditions are essential. Substrate temperature shall be at least 3°C above the dew point and always above 0°C. At application temperatures below 10°C, drying and curing times will be significantly extended, and spraying characteristics may be impaired. Application at ambient air temperatures below 5°C is not recommended. If it is desired to overcoat outside the times stated on the data sheet, please seek advice of Sherwin-Williams.

Additional Notes: Any skin that may form on the surface of the paint in the container should be removed carefully to avoid the necessity of sieving the paint. When used as a primer onto bare wood, the product should be thinned 10% with Cleanser Thinner No. 1 to improve surface wetting and penetration.