Sherwin-Williams Magnalux 42PP is a two/three component polyester based holding primer for use under all polyester and vinyl ester coatings.

It is overcoatable with other Magnalux products and is suitable for use on both blast cleaned steel and concrete surfaces (service temp up to 85°C). For the vinyl ester based version which is suitable for service temperatures above 85°C please see Sherwin-Williams Magnalux 41VP

Magnalux products must not be applied over any existing painted surface, or any substrate which contains copper or zinc compounds. This includes sprayed surfaces.

Please note: This product is subject to a 14 day lead time upon ordering.

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• Features & Benefits
• Recommended Application Methods
• Product Characteristics
• Recommended Topcoats
• Practical Application Rates
• Average Drying Times
• Application Equipment
• Surface Preparation
• Application Conditions & Overcoating
• Additional Notes
• Health & Safety

Features & Benefits

• Two/three component polyester based holding primer
• For use under all polyester and vinyl ester coatings
• Overcoatable with other Magnalux products
• For the vinyl ester based version which is suitable for service temperatures above 85°C please see Sherwin-Williams Magnalux 41VP
• For use on both blast cleaned steel and concrete surfaces (service temp up to 85°C)
• Touch dry in approximately 1.5 hours at 23°C
• Low VOC - 0.8 gms/litre determined practically in accordance with UK Regulations PG6/23
• Good coverage of up to 20m²/ltr at 30 microns DFT
• Magnalux products must not be applied over any existing painted surface, or any substrate which contains copper or zinc compounds. This includes sprayed surfaces

Recommended Application Methods

Application Method:

• Airless Spray
• Brush
• Roller

Recommended Cleanser:

• No.13 for cleaning only
• Product must not be thinned

Product Characteristics

*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.

** All vinyl/polyester resin systems are subject to monomer loss and material shrinkage during application and curing.

Mixing Ratio:

Sherwin-Williams Magnalux 42PP is a two/three component material supplied in separate containers to be mixed prior to use (Retarder above 15°C required)

• 100 parts base to 2 parts catalyst by weight
• Below 15°C, add catalyst to base component and mix thoroughly with a mechanical stirrer for at least 2 minutes
• Above 15°C, add retarder (included) to base and mix thoroughly with a mechanical stirrer for at least 2 minutes
• Allow a minimum of 3 minutes before adding catalyst, then stir for a further 2 minutes
• DO NOT add retarder after the catalyst

Shelf Life:

• 6 months or ‘Use By’ date where specified
• Store at or below 25°C

Recommended Topcoats

Overcoatable with other Magnalux products.

Practical Application Rates

*Maximum sag tolerance with overlap typically 50μm dry by airless spray

Average Drying Times

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

Application Equipment

Airless Spray:

• 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

Note:

• Airless spray application should not be used for priming concrete
• Use only brush or roller application for concrete substrates (preferably brush)

Brush:

• The material is suitable for brush application
• Application of more than one coat may be necessary to give equivalent dry film thickness to a single spray applied coat

Roller:

• The material is suitable for roller application
• Application of more than one coat may be necessary to give equivalent dry film thickness to a single spray applied coat

Surface Preparation

• Blast clean to Sa2½ ISO 8501-1:2007. Minimum surface profile 75 microns
• Ensure surfaces to be coated are clean, dry and free from all surface contamination
• Concrete - consult Sherwin-Williams Technical Support or Rawlins Paints' Technical Support Team on 0113 2455450 (option 2) or send a message to [email protected]

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 15°C, drying and curing times will be significantly extended, and spraying characteristics may be impaired
• If application and curing temperatures fall below 5°C, full cure may not be obtained - post curing may be required for certain aggressive environments - see additional notes
• Application at steel temperatures above 50°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

• Drying times, curing times and pot life should be considered as a guide only
• Solids by volume of the product can vary significantly, depending on the amount of monomer lost and shrinkage during application and curing
• Method of application and temperature/ventilation conditions will therefore affect the practical solids contents
• The reaction between the base component and catalyst is highly exothermic
• Deviation from the recommended mixing ratio should not be undertaken without first consulting Sherwin-Williams
• The catalyst must be stored separately from the base, and from any other paint or chemical products, in accordance with the product safety data sheet
• The quoted pot lives are typical figures for a full 20 litre unit @ 2% catalyst level
• Should any thickening or lumps appear in the mixed product, this should be discarded and the equipment flushed through and cleaned immediately
• Reduction in catalyst level and/or volume of mixed product will extend the pot life
• Flushing of spray equipment is essential before any break in work, and is recommended at regular intervals throughout the application procedure
• Only mix units of Magnalux as they are required for immediate use
• Magnalux products should not be thinned with cleanser thinners or any other solvent
• Thinning will severely impair the curing mechanism and subsequent performance
• Thinning with normal paint solvent can lead to exothermic reaction and possible fire or explosion hazard
• Magnalux products must not be applied over any existing painted surface, or any substrate which contains copper or zinc compounds
• This includes sprayed surfaces
• Numerical values quoted for physical data may vary slightly from batch to batch

Health & Safety

Consult Safety Data Sheet for information on safe storage, handling and application of this product.

Please contact Rawlins Paints' Technical Support Team on 0113 2455450 (option 2) or send a message to [email protected] for more information.