Overview

Johnstone’s Trade Stormshield Flexible Primer Undercoat is a premium-quality, microporous undercoat designed to provide a strong, flexible base for exterior woodwork and suitably primed metal surfaces. Offering greater flexibility than traditional undercoats, it helps prevent cracking and flaking, ensuring a longer-lasting finish. Specially formulated for use with Johnstone’s Trade Stormshield Flexible Gloss or Satin, this undercoat provides up to 8 years’ life expectancy as part of the complete system.

• Premium microporous exterior undercoat
• Provides a flexible base to reduce risk of cracking and peeling
• Designed for use with Stormshield Flexible Gloss or Satin

Preparation

Ensure the surface is clean, dry and free from dirt and grease.

• Remove any loose or flaking material.
• For maximum performance from this microporous product, completely remove old paint and varnish. Treat bare wood surfaces with Johnstone's Trade Universal Primer.
• For bare timber, apply one coat of Johnstone's Trade Flexible Primer Undercoat followed by two coats of Johnstone's Trade Flexible Gloss or Satin.
• Prime bare metal with Johnstone's Trade Universal Primer.
• Rub down previously gloss painted surfaces with fine waterproof abrasive paper and rinse thoroughly before applying a pre-coat of Johnstone's Trade Stormshield Flexible Primer Undercoat.
• Plastic rainwater products should be cleaned thoroughly and given two coats of Johnstone's Trade Stormshield Flexible Satin.

Application

Always test a small area of the surface to be painted to ensure you are happy with the finished results

• Ensure all surfaces are clean, dry, and sound before application.
• Stir well and apply evenly with a brush.
• Allow to dry fully before applying Stormshield topcoats.
• Follow Johnstone’s Trade Technical Specification and BS 6150:2019 Code of Practice for best results and long-term protection.

Aftercare & Storage