Surface coatings
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Surface coatings are applied to materials like steel and timber to protect them from corrosion and rotting, to decorate surfaces and add special effects, and to sanitize items by making them easier to clean. Paint consists of a thinner, binder, and pigment and dries through the processes of evaporation, oxidation, and coalescence as the binder particles fuse together into a film. When mixing a two-part coating, it is important to follow the manufacturer's recommendations on ratios and be aware of the mixture's pot life, which refers to the usable life of the mixture before it starts to cure and become unusable.
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This document discusses different types of surface coatings used in painting. It describes primers, undercoats, gloss, eggshell, emulsion, acrylic, and varnish paint finishes. It provides instructions for preparing various surfaces like walls, wood, and old paintwork for painting. Walls should be protected with dustsheets and loose plaster removed before painting. New wood requires sanding, knotting, and filler while old paint needs flaking paint removed and sanding to prepare for new coats.
Protection
Dustsheets made of polythene or canvas should be used to protect furniture, floors, and other items from dust and splashes of paint when decorating. Polythene sheeting can be used to cover floors and protect vehicles, windows, and other items that cannot be removed from the work area. Tenting in with scaffolding and polythene sheeting cordons off an area for spray painting.
Surface coatings
Surface coatings are applied to materials like steel and timber to protect them from corrosion and rotting, to decorate surfaces and add special effects, and to sanitize items by making them easier to clean. Paint consists of a thinner, binder, and pigment and dries through the processes of evaporation, oxidation, and coalescence as the binder particles fuse together into a film. When mixing a two-part coating, it is important to follow the manufacturer's recommendations on ratios and be aware of the mixture's pot life, which refers to the usable life of the mixture before it starts to cure and become unusable.
Surface & Tin defects
This document discusses various types of painting and tin defects including surface defects, internal paint failures, external paint defects, and defects in tin that can occur. It focuses on identifying and addressing issues that may arise with paint and tin coatings.
Surface defects
This document provides information on various surface defects and how to repair them. It discusses removing rust by hand or power tools, treating friable surfaces before painting, removing mould growth, repairing defective puttying and plasterboard, dealing with efflorescence on cement, repairing damaged rendering, and properly applying caulk. The key is to prepare surfaces thoroughly, use the right tools for each job, and avoid over-polishing or damaging the surface further during repairs.
Health and safety
This document discusses several important topics in workplace health and safety:
- The Health and Safety at Work Act establishes duties for employers and employees to protect worker and public safety.
- The Control of Substances Hazardous to Health Regulations provide guidelines for handling hazardous materials safely.
- Proper safety techniques and personal protective equipment are necessary for tasks like manual handling, working at heights, and using hazardous substances to prevent injuries.
- Other important safety practices covered include first aid, accident reporting, use of safety signs, fire safety, and conducting risk assessments. Following these procedures helps create a safe working environment.
Building loads
There are three main types of structural loading: tension, compression, and shear. Tension pulls or stretches material, compression squeezes material, and shear occurs when one part of a component slides over another. All buildings have a substructure below ground, including foundations, and a superstructure above ground. Primary elements of the superstructure are the main supporting, enclosing, and protecting elements like floors and walls that divide space and provide access between floors. Secondary elements are not essential for strength but provide specific functions like completing openings in walls. Finishing elements are the final surfaces of a building like flooring or wall finishes that can be functional or decorative.
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Changes in vegetation cover refer to variations in the distribution, composition, and overall
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1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
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Surface coatings
- 1. © City of Glasgow College Charity Number SC0 36198 Surface Coatings
- 2. To protect – stops steel corroding, timber rotting To decorate – improves appearance, special effects To sanitise – more hygienic, easier to clean To identify – pipework and other items Why apply coatings?
- 3. Paint is either water-based or solvent-based. It consists of three parts: • thinner • binder • pigment. Paint
- 4. Evaporation – the water/solvent component evaporates Oxidation – the paint reacts with oxygen in the air Coalescence – binder particles fuse together into a film How does paint dry?
- 5. Mixing a two-pack coating Always • follow the manufacturer’s recommendations • use the correct ratio of base to hardener • be aware of the mixture’s pot life. What does the term ‘pot life’ mean?