The document discusses wallpaper defects that can occur during the application of wallpaper. It identifies common defects such as stained surfaces, loose edges, stretching, delamination and blisters. For each defect, it lists potential causes such as poor preparation, incorrect application of adhesive, over-soaking of paper, and uneven application of adhesive. It provides remedies and prevention methods for each defect type to ensure proper application of wallpaper.

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Level 2 Diploma in Painting and Decorating
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Wallpaper defects
Unit 217: Applying standard papers to ceilings and
walls

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Level 2 Diploma in Painting and Decorating
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Wallpaper defects
Task
What is a defect and what can cause defects in applying wallpapers?
- Discuss in groups

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Level 2 Diploma in Painting and Decorating
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Wallpaper defects
Types of defect
• Poor preparation methods
• Incorrect method of applying adhesive
• Poor application methods

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Level 2 Diploma in Painting and Decorating
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Causes of wallpaper defects
Stained/marked surface
Causes:
• Paste on paper face due to careless pasting techniques
• Contaminated tools and equipment
• Dirt contamination due to unclean work surfaces during soaking
Discuss a remedy or prevention method:
• Take appropriate care during paste application
• Ensure tools and equipment are free from contamination
• Ensure all surfaces in contact with paper are clean

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Level 2 Diploma in Painting and Decorating
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Wallpaper defects
Loose/ springing/ dry edges
• Uneven application of adhesive (misses)
• Edges not aligned during soaking
• Incorrect adhesive
Discuss a remedy or prevention method
• Make sure paper surface has had an full/even application
of adhesive
• Ensure paper is correctly folded during soaking
• Use manufacturers recommended adhesive type

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Level 2 Diploma in Painting and Decorating
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Wallpaper defects
Stretching
• Over-soaking
• Overuse of paper hanging brushes/spatulas
Discuss a remedy or prevention method
• Ensure paper is soaked as per manufacturer's instructions
• Use correct application techniques when smoothing papers

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Level 2 Diploma in Painting and Decorating
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Wallpaper defects
Delamination
• Adhesive too thin
• Inadequate soaking time
Discuss a remedy or prevention method
• Ensure paste is mixed according to manufacturers instructions
• Ensure paper is soaked as per manufacturers instructions

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Level 2 Diploma in Painting and Decorating
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Wallpaper defects
Blisters
• Uneven application of adhesive (misses)
• Adhesive to thin
• Inadequate soaking time
• Poor application methods (smoothing of paper)
Discuss a remedy or prevention method
• Make sure paper surface recives a full/even application of adhesive
• Ensure paste is mixed according to manufacturer's instructions
• Ensure paper is soaked as per manufacturer's instructions
• Use correct application techniques when smoothing papers

9. © 2013 City and Guilds of London Institute. All rights reserved.
Level 2 Diploma in Painting and Decorating
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Wallpaper defects
Task
• In groups, complete Activity 20
• Compare and analyse your answers with the rest of your group

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Level 2 Diploma in Painting and Decorating
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Questions
1. Which defect is caused by over-soaking?
2. State two causes of blisters in wallpaper.