The document discusses different types of adhesives used for painting and decorating, including cellulose adhesive, starch adhesives, and ready mixed adhesives. It describes the properties of each type, when they should be used, and how to properly mix them. The document also covers potential defects from improper mixing, health hazards to be aware of, and factors to consider when selecting the correct adhesive for a surface or paper type.

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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?