Poor adhesion – polyester stopper

Cause

• Poor substrate preparation

• Polyester material unsuitable for galvanized substrate

• Surface temperature too high while forced drying

• Undercured – too much/too little hardener

Prevention

• Clean and sand thoroughly

• Only use Standox Stopper recommended for galvanized substrates

• Follow the manufacturer’s instructions for forced drying

• Keep to the mixing ratio

• Ensure hardener is completely mixed into the polyester stopper

Remedy

• Sand the damaged repair area well to remove all polyester stopper

• Only use Standox Stopper recommended for galvanized substrates

• Repair and repaint