Sherwin-Williams Kem-Kromik 671


Ken-Kromik 671 (formerly known as Sherwin-Williams M671 and as Leighs M671) is a high quality undercoat/tiecoat developed for marine use on above waterline areas but also suitable for normal interior and exterior use. It is a single component, conventional quick drying undercoat/tiecoat. Ken-Kromik 671 may also be used as a wood primer for interior or exterior use, please refer to Additional Notes below.

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Ken-Kromik 671 (formerly known as Sherwin-Williams M671 and as Leighs M671) is a high quality undercoat/tiecoat developed for marine use on above waterline areas but also suitable for normal interior and exterior use. It is a single component, conventional quick drying undercoat/tiecoat.

Recommended Primers/Topcoats

Ken-Kromik 671 can be overcoated with a wide range of white spirit based finishes


  • BS476 Part 7 - Surface Spread of Flame Material - for details of substrate/scheme, consult Sherwin-Williams.

Surface Preparation

Ensure surfaces to be coated are dry and free from all visible traces of surface contaminants.

Application Equipment

Suitable for applying by brush and roller. Application of more than one coat may be necessary to give equivalent dry film thickness to a single spray applied coat.

Airless Spray

  • Nozzle Size: 0.38-0.46mm (15-18 thou)
  • Fan Angle: 80°
  • Operating Pressure: 140kg/cm² (2000 psi)

The airless spray details given above are intended as a guide only. Details such as fluid hose length and diameter, paint temperature and job shape and size all have an effect on the spray tip and operating pressure chosen. However, the operating pressure should be the lowest possible consistent with satisfactory atomisation. As conditions will vary from job to job, it is the applicators’ responsibility to ensure that the equipment in use has been set up to give the best results. If in doubt our technical team should be consulted

Conventional Spray

  • Nozzle Size: 1.27mm (50 thou)
  • Atomising Pressure: 3.5kg/cm² (50 psi)
  • Fluid Pressure: 0.7kg/cm² (10 psi)

The details of atomising pressure, fluid pressure and nozzle size are given as a guide. It may be found that slight variations of pressure will provide optimum atomisation in some circumstances according to the set up in use. Atomising air pressure depends on the air cap in use and the fl uid pressure depends on the length of line and direction of feed i.e. horizontal or vertical.

For application by conventional spray, thin up to 5%. Wet film thickness should be adjusted accordingly. NB - Thinning will affect VOC compliance.

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.

The maximum air and substrate temperature for application is 50oC providing conditions allow satisfactory application and film formation. If the air and substrate temperatures exceed 50oC and coatings are applied under these conditions, paint film defects such as dry spray, bubbling and pinholing etc, can occur within the coating. If for any reason it is desired to apply at a higher temperature, please seek advice of our Technical Team.

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% to improve surface wetting and penetration.

Numerical values quoted for physical data may vary slightly from batch to batch. 

Typical Thickness and Coverage

Dry film thickness

35 microns

Wet film thickness

67 microns

Theoretical coverage

14.9 m² /ltr*

*This figure makes no allowance for surface profile, uneven application, overspray or losses in containers and equipment. Film thickness will vary depending on actual use and specification.

Practical Application Rates

Microns per coat

Airless Spray Conventional Sprayer Brush Roller
Dry 55* 50 35 35
Wet 105 101 67 67

* Maximum sag tolerance typically 163μm wet (85μm dry )by airless spray. The conventional spray details relate to the paint after 5% thinning

Average Drying Times

15°C 23°C
To touch: 2½ hours 1½ hours
To recoat: 7 hours 4 hour
To handle: 24 hours 16 hours

These figures are given as a guide only. Factors such as air movement and humidity must also be considered.

Product Details

Data sheet

For Use By
Industrial Use
Interior / Exterior Use
Interior & Exterior
For Use On
Metal, Wood
Application Method
Airless Spray, Spray, Brush, Roller
Standard / Ready Mixed
Single, Two or Three Pack
Pack Size
14.9m² per litre
Touch Dry
1.5 hours
UN Number
Base Type
Suitable For Use On
Suitable For Use On
Application Method
Application Method
Application Method
Product Type
Tie Coat
Product Range
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Anthracite Grey
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family
Colour Family

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

questions Gary Coombes on 2023-01-25 15:35:59

Would like to find out about M671 Undercoat about recoating times. What’s the longest I could leave it before recoating again

Answer from Rawlins’ Technical Team: 

With it being only a single pack alkyd undercoat that is matt or sheen in appearance then providing the surface is free of all contaminants it is indefinetly overcoatable.

Question about the product

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Sherwin-Williams Kem-Kromik 671 is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

All delivery costs below are excluding VAT