Adhesives

1. Level 1 Diploma in Painting and Decorating
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PowerPoint
presentationAdhesives
Unit 119: Applying foundation and plain papers

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Adhesives
Adhesives come in:
• Ready mixed tubs
• Sachets of dry powder flakes that need to be mixed with water
Adhesives are also available for use with specific wall coverings.
Courtesy of Henkel Courtesy of Henkel

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Adhesives
Cellulose adhesive
This has the highest water content of any paste and comes in a powder
form that needs to be mixed with cold water.
• Easy to apply and mix
• Inexpensive
• Contains a fungicide
• Can cause paper to over-expand

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Adhesives
Starch adhesives
These are known as flour adhesives, as flour is the main ingredient.
• Suitable for hanging heavy textured preparatory papers
• Contains a fungicide
• More expensive than cellulose
• Difficult to mix
• Can stain

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Adhesives
Ready mixed
Ready mixed with a low water content.
• Very strong adhesion
• Can be used to size surfaces
• Contains a fungicide
• Very expensive

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Adhesives
Factors to consider when choosing the correct adhesive:
• Type of surface
• Paper type
• Recommended adhesive
Online resource:
www.youtube.com/watch?v=De25rq4Bxls&feature=player_detailpage

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Adhesives
Mixing paste correctly
• Read the manufacturers’ instructions first.
• Follow the manufacturers’ instructions to achieve the correct
consistency.
1. Fill a bucket with the specified amount of water.
2. Add the paste slowly whilst continually stirring the water.
3. Leave to stand for a few minutes to thicken.
4. Stir again and add water if the paste is too thick.
Tip: Mix the paste thicker – you can add water to thin it but you cannot
add paste to make it thicker if it is too thin.

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Adhesives
Defects
Poor mixing can cause defects in the consistency of the paste and
result in poor application such as:
• Lumps, too thin or too thick, and contamination
• Blisters, delaminating, stretching and tearing
• Dry edges, springing joints, polished joints, blistering

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Adhesives
Health hazards associated with adhesives
• Fungicide
• Ingestion
• Dermatitis
• COSHH
• Disposal of waste material

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Any questions?