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Level 1 Diploma in Painting and Decorating
© 2013 City and Guilds of London Institute. All rights reserved. 1 of 4
PowerPoint presentation
Primers and sealers
Unit 117: Preparing surfaces for decoration
Level 1 Diploma in Painting and Decorating
© 2013 City and Guilds of London Institute. All rights reserved. 2 of 4
Knotting solutionWhere is it used?
Knotting solution is used on bare timber that requires knots in the timber to be sealed prior to decorating. Failure to do this will result in the resin seeping from the knot and staining the paintwork.
Different types
It comes in three types:
• Shellac
• Patent
• White knotting
What do you think it is made from?
Level 1 Diploma in Painting and Decorating
© 2013 City and Guilds of London Institute. All rights reserved. 3 of 4
Types of primerPrimers are important as they seal and protect the surface.
Failure to prime the surface will result in the paint system breaking down and the surface rotting or rusting.
• Acrylic
• Universal wood
• Universal metal
• Alkali resisting
• Aluminium
Level 1 Diploma in Painting and Decorating
© 2013 City and Guilds of London Institute. All rights reserved. 4 of 4
Any questions?