Mylands Primer & Undercoat - Dark Grey - 10 Litre

A high opacity, low odour, micro-porous, water thinned wall primer sealer displaying excellent adh...

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Mylands UKMylands Dark/Grey Primer & Undercoat - Multi-Surface Primer & Undercoat - 1 Litre
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Product Information

Full details

Mylands Primer & Undercoat in Dark Grey is designed for professional painters and DIY enthusiasts seeking a high-performance base layer for their interior projects. This water-thinned, low-odour formula provides excellent adhesion to a variety of substrates, including new plaster and patch-repaired surfaces, ensuring your topcoat remains durable and color-true. While it offers superior coverage and ease of use, users should note that as a dark-tinted primer, it is specifically optimized to support darker topcoat finishes or high-pigment colors.

All features

ColourGrey
Model Part Number500100033/13
BrandMylands

Extended Product Information

FAQs

Can I use this on exterior walls?

No, this product is specifically formulated for internal applications.

Does this primer need to be thinned?

It is supplied ready for use, though small amounts of water can be added if required by the application method.

How long should I wait before painting over it?

Drying times vary by temperature and humidity; typically, it is touch dry within a few hours, but allow sufficient time as recommended on the product label.

Is this primer compatible with all paints?

It is highly recommended for use under Mylands water-based finishes, though it adheres well to most standard decorative paints.

Why is it dark grey instead of white?

The dark grey tint is designed to improve the depth and coverage of darker topcoat colors.

Troubleshooting

Primer is not covering the surface evenly

Ensure the surface is properly sanded and cleaned; apply a second coat if the substrate is exceptionally porous.

Brush marks visible after drying

Use a high-quality synthetic brush and ensure you are not over-working the product as it begins to tack.

Poor adhesion to the wall

Verify the substrate was free of grease or dust before application; if the surface was glossy, lightly sand it to provide a 'tooth' for the primer.

Pros and Cons

Pros

  • Durable adhesion on various interior surfaces
  • Easy cleanup due to water-thinned composition
  • Provides a consistent dark base for deep-toned paint
  • Low-odour formula improves indoor air quality during application
  • Ideal for covering repairs and new plaster

Cons

  • Specifically tinted dark, which may require more coats if switching to a light topcoat
  • Requires proper surface preparation for maximum performance
  • Not suitable for high-traffic exterior applications

Setup, Compatibility & Care

Before application, ensure the substrate is clean, dry, and free from loose paint, dust, or grease. If applying to new or porous plaster, ensure the area has fully cured as per the plaster manufacturer's guidelines. Stir the primer thoroughly before use to ensure the pigments are properly suspended. Apply using a medium-pile roller or a synthetic bristle brush. Once finished, clean all tools immediately with warm soapy water while the product is still wet. Store the container in a cool, dry place and ensure the lid is tightly sealed to prevent the product from drying out.

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