Exterior Undercoat


0.75L, 2.5L

Coverage (per litre)

12 m²

Dry Time

16-24 Hours

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Professional Painter

Product Details

Johnstone’s 6 Year Exterior Undercoat has been specially developed to be used in conjunction with Johnstone’s 6 Year Exterior Gloss to provide an exceptionally durable and long lasting high gloss finish for exterior wood and metal. The special formula retains flexibility for longer than traditional undercoats and is resistant to blistering, cracking & peeling.


  • Weather protection
  • Crack and peel resistance
  • 6 Year Life
All surfaces should be clean, dry and free from grease. Remove any loose or flaking paint. Rub down sound glossy surfaces with fine waterproof abrasive paper and rinse thoroughly to provide a key. Avoid the inhalation of dust. Always wear a suitable face mask if dry sanding. Treat new or bare wood surfaces with a clear preservative, prime metal surfaces with an appropriate metal primer.
Stir well before use and apply by brush or roller. For best results do not apply too thickly. Over bare wood and metal apply one coat of Johnstone’s Exterior Undercoat followed by two coats Johnstones Exterior Gloss. Plastic rainwater products should be cleaned thoroughly and given two coats of Johnstone’s Exterior Gloss.
Remove as much product as possible from brushes and rollers before cleaning. Clean all equipment immediately after use in White Spirit or Turpentine Substitute