Johnstone's
Johnstone's Exterior Undercoat 2.5L
Johnstone's Exterior Undercoat 2.5L
SKU:668285
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Free delivery for orders over £100 within UK mainland. This does not apply to large products (such as those above 1m of length), heavy products (including aggregates, compost and wood logs) and fragile products (such as ceramics, shower enclosures etc.). See shipping policy for restrictions.
Free local delivery above £50 and £5 charge for delivery under £50 within a 3 mile radius and £7 up to 6 mile radius.
Standard Shipping - United Kingdom (UK Mainland Excluding Northern Ireland)
- Lighter items (under 1kg) - £4 and free for orders over £100
- Smaller items (1 - 10kg) - £7 and free for orders over £100
- Larger items (10kg - 30kg) - £15 and free for orders over £350
- Bulky items (30kg and above) - £35 with minimum order value of £100
Express Shipping - United Kingdom (UK Mainland Excluding Northern Ireland)
- Lighter items (under 1kg) - £7 and free for orders over £100
- Smaller items (1 - 10kg) - £10 and free for orders over £100
- Larger items (10kg - 30kg) - £20 and free for orders over £350
Standard Shipping (Northern Ireland and Scottish Islands & Highlands) 2 to 7 business days
- Lighter items (under 1kg) - £7
- Smaller items (1 - 10kg) - £15
- Larger items (10kg - 30kg) - £25
- Bulky items (30kg and above) - £35 with minimum order value of £100
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Johnstone's 6 Year Exterior Undercoat in Dark Grey is an essential preparatory coating designed to deliver long-lasting protection and a superior finish when used in combination with Johnstone's Weatherguard 6 Year Exterior Gloss. Developed with a specially formulated oil-based blend, this undercoat offers superior adhesion, flexibility, and resistance to harsh outdoor elements, making it ideal for use on exterior wood and metal surfaces.
Engineered for durability and performance, it significantly improves the lifespan and appearance of your topcoat by providing a strong, even base that resists cracking, peeling, and blistering.
Key Features:
- Specifically Designed for Exterior Use: Ideal for preparing wood and metal surfaces for gloss finishing.
- Durability: Engineered to support a full 6-year protection system when paired with Johnstone’s Weatherguard Exterior Gloss.
- Flexible Formula: Maintains adhesion and flexibility in changing weather conditions, reducing the risk of cracking and peeling.
- Weather Resistance: Forms a tough, moisture-resistant base coat that shields surfaces from the effects of rain, wind, and UV exposure.
- Oil-Based Composition: Ensures excellent penetration, surface binding, and adhesion, even on weathered surfaces.
- High Opacity: Provides excellent coverage and a uniform surface for gloss application.
Technical Specifications:
| Property | Description |
|---|---|
| Finish | Undercoat (to be overcoated) |
| Colour | Dark Grey |
| Volume | 2.5 Litres |
| Coverage | Up to 30m² (12m² per litre) |
| Touch Dry Time | 4–6 hours |
| Recoat Time | Allow to dry fully before recoating |
| Application | Brush or roller |
| Base | Oil Based |
| Recommended Use | Exterior wood and metal |
Boxed Weight:
| Specification | Value |
|---|---|
| Weight | 3.0kg |
Additional Information:
- Country of Origin: Great Britain
- Commodity Code: 3209100000
Frequently Asked Questions (FAQs)
Q: Can this undercoat be used without a gloss topcoat?
A: While it provides protective properties, this product is designed to be used in combination with Johnstone’s Weatherguard Gloss for a complete exterior paint system. It is not intended as a standalone finish.
Q: How many coats of undercoat are needed?
A: Typically, one coat of undercoat is sufficient, but a second may be applied for highly porous or previously untreated surfaces to ensure uniform coverage and optimum adhesion.
Q: Is it suitable for use on plastic or masonry?
A: This undercoat is specially formulated for use on exterior wood and metal. For plastic or masonry, use a suitable primer or undercoat recommended for those surfaces.
Q: How should the surface be prepared before applying the undercoat?
A: Surfaces should be clean, dry, and free from grease or loose material. Sand down glossy or previously painted areas to improve adhesion.
Warranty Information:
Johnstone’s Exterior Undercoat is manufactured to the highest quality standards to provide reliable performance when used as directed. For best results and to maintain the 6-year exterior protection system, it must be applied in conjunction with Johnstone’s Weatherguard 6 Year Exterior Gloss. The product is backed by a manufacturer warranty that covers defects in materials and workmanship. It does not cover improper surface preparation, incorrect application, or damage due to extreme environmental conditions.
