Description Johnstone’s Trade Flexible Primer Undercoat Johnstone’s Trade Flexible Primer Undercoat �� Full Product Description: Johnstone’s Trade Flexible Undercoat – The Essential Base for Exterior Flexible Finishes Johnstone’s Trade Flexible Undercoat is a durable, weather-resistant basecoat designed to work with Johnstone’s Flexible Gloss and Flexible Satin systems. Its flexible, breathable formulation helps resist cracking, flaking, and blistering by moving with the natural expansion and contraction of exterior timber. It provides excellent coverage and opacity, helping to mask surface imperfections and create a smooth, even base. Ideal for use on previously painted or bare wood (when primed), Flexible Undercoat boosts the durability and aesthetic finish of your topcoat. ✅ Key Features: Flexible formulation resists cracking and peeling Provides strong adhesion for flexible topcoats Smooth, even coverage with great opacity Designed for exterior timber and metal Breathable and weather-resistant Compatible with Flexible Gloss and Satin �� Ideal For: Exterior timber: doors, windows, fascia boards Metal railings and trim (with proper prep) As a basecoat for Flexible Gloss or Satin Use on primed or previously painted surfaces �� Technical Details: Property Value Finish Flat / Low sheen Coverage Up to 14m² per litre Recoatable Time 16–24 hours Touch Dry 4–6 hours Application Brush or roller Pack Sizes 1L, 2.5L, 5L VOC Level Low Colour Range White & colour-matched to topcoat �� Surface Preparation & Application: Ensure surfaces are clean, dry, and sound. Sand and key previously painted areas. Prime bare timber with a suitable primer. Stir thoroughly and apply 1–2 coats of Flexible Undercoat before finishing with Flexible Gloss or Satin. ⚠️ Important Notes: Use only as part of the Johnstone’s Flexible system Not suitable for interior use Avoid application in damp or very cold weather
