Shopping.co.uk

Johnstone's Exterior Undercoat - White

Not AvailableJohnstone's Exterior Undercoat - White
Not Available
Not Available

Prepare your outdoor spaces for perfection with Johnstone's Exterior Hardwearing Undercoat. Design...

Currently unavailable

Colour
GreyWhite

Currently out of stock

This product is not available at the moment. Check back later or explore other options below.

Product Information

Full details

The Johnstone's Exterior Hardwearing Undercoat in White is for DIY enthusiasts and professional painters seeking to enhance the longevity and appearance of their exterior wood and metal surfaces. Its key benefit is providing a robust, weather-resistant foundation that ensures superior adhesion and a flawless finish for your topcoat, significantly extending the life of painted exteriors. A caveat to be aware of is its suitability primarily for exterior use on wood and metal, and its oil-based formulation may require specific application and cleaning methods.

All features

ColourWhite
Model Part Number303908
BrandJohnstone's

Extended Product Information

FAQs

What surfaces can I use Johnstone's Exterior Hardwearing Undercoat on?

This undercoat is suitable for exterior wood and metal surfaces. It is specifically formulated to work in conjunction with Johnstone's 6 Year Exterior Gloss.

Is this undercoat suitable for interior use?

No, this product is specifically designed for exterior applications and should not be used indoors.

How long does it take to dry?

The undercoat is touch dry in approximately 4-6 hours under normal conditions. Full drying and recoating times may vary based on temperature and humidity.

What is the coverage rate?

The coverage rate is approximately 12 square metres per litre.

How do I clean my brushes and equipment after use?

Clean brushes, rollers, and equipment immediately after use with white spirit or another suitable degreaser.

Can I use this undercoat with other brands of topcoat?

While it is formulated to work best with Johnstone's 6 Year Exterior Gloss, it may be compatible with other oil-based exterior topcoats. Always test on a small, inconspicuous area first if unsure.

What are the storage recommendations?

Store the paint in a cool, dry place with the lid tightly sealed, away from direct sunlight and extreme temperatures. Ensure it is kept out of reach of children.

Troubleshooting

Undercoat not adhering well or peeling

Ensure the surface was properly prepared, clean, and dry before application. Remove any loose paint or contaminants. For wood, ensure a wood preservative was applied if necessary. For metal, ensure rust was removed and a metal primer used if recommended.

Uneven finish or brush marks visible

Ensure the undercoat was stirred thoroughly. Apply in thin, even coats rather than one thick coat. Use a good quality brush or roller suitable for oil-based paints. Avoid over-brushing. Allow adequate drying time between coats.

Paint appears too thick or difficult to apply

Ensure the paint has been stored correctly and not exposed to extreme temperatures. If necessary, very thin with a small amount of white spirit according to manufacturer recommendations, but avoid over-thinning, which can affect performance.

Slow drying time

Drying times are estimates and can be affected by temperature, humidity, and the thickness of the application. Ensure application occurred within the recommended temperature range (10°C-30°C) and avoid very humid conditions. Ensure adequate ventilation.

Pros and Cons

Pros

  • Provides excellent adhesion for topcoats, reducing risk of peeling.
  • Offers strong protection against moisture, preventing rot and rust.
  • Enhances the overall durability and lifespan of exterior paintwork.
  • Suitable for a range of exterior surfaces like wood and metal.
  • Good coverage rate of 12m² per litre for efficient application.

Cons

  • Oil-based formulation requires specific solvents for cleanup.
  • Touch dry time of 4-6 hours may extend project timelines.
  • Not suitable for interior use.
  • Delivery is restricted to certain geographical locations (e.g., not Isle of Wight, Isle of Man, or Ireland).

Setup, Compatibility & Care Instructions

Preparation: Ensure surfaces are clean, dry, and free from grease, dust, and flaking paint. For bare wood, apply one coat of suitable wood preservative. For metal, remove any rust and apply a suitable metal primer if necessary.

Application: Stir the undercoat thoroughly before use. Apply evenly with a brush or roller. For optimal results, apply in dry conditions, avoiding direct sunlight or high humidity. Avoid applying in temperatures below 10°C or above 30°C.

Compatibility: This undercoat is specifically designed for use with Johnstone's 6 Year Exterior Gloss. It is suitable for exterior wood and metal surfaces. It is an oil-based product.

Care & Cleaning: Clean brushes, rollers, and equipment immediately after use with white spirit or a suitable degreaser. Store leftover paint in a cool, dry place, with the lid tightly sealed, away from direct sunlight and extreme temperatures. Ensure it is out of reach of children.