Surface coatings

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PowerPoint
presentationSurface coatings
Unit 118: Applying paint systems by brush and
roller to non-complex areas

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Why do we use surface coatings?
• Protect
• Decorate
• Sanitise
• Identify

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Surface coatings categories
• Paint
• Varnish
• Wood stain
• Sealers and preparatory coatings

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Paint
• Can be either waterbourne or solventbourne
• Interior or exterior
• Used on plaster, timber or metal surfaces
• Various coating systems such as primer, undercoat, top coat,
emulsion and masonry
• Various finishes such as matt, mid sheen, silk, eggshell, satin and
gloss

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Paint components
• Water-based contains thinner/binder/pigment
• Solvent-based contains thinner/binder/pigment/dryer

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Varnishes
• Can be water-based or solvent-based
• Interior or exterior
• Used on new or old wood
• A transparent finish that comes in matt, satin or gloss finish
• Provides a tough water and heat-resistant coating when dried

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Components of varnish
Varnish has three components (like paint):
• Drying oil
• Resin
• Thinner

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Wood stains
• Applied to new or old timber
• Type of dye
• Variety of colours
• Interior or exterior
• Normally needs to be
varnished afterwards

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Sealers and preparatory coatings
• Used as a preparation coating on interior and exterior surfaces
• Seals surfaces prior to decorating
• Offers longer lasting protection and finish
• Types:
– Knotting solution
– Stablilising solution
– Mist coats
– Water sealers

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Volatile organic compounds (VOCs)
• What are volatile organic compounds?
• New regulations were introduced in 2010
• A labelling system is used with five bands. For example:
– Minimal VOC content – 0-0.29% acrylic primer
– High VOC content – 25-50% wood primer or oil-based
gloss
What products are exempt?

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Any questions?