Departments› Interior Design› Module II› Interior Design Finishing› Ch 5: Apply interior painting
Interior Design  ·  Level 6
Interior Design Finishing
Chapter 5: Apply interior painting
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⚑ What you will be able to do

By the end of this chapter, you will be able to:

  • Analyse paint effects to match your client's preferences and vision.
  • Choose the most suitable painting techniques for different interior projects.
  • Identify and select the right tools and equipment for every painting job.
  • Prepare interior surfaces properly to ensure a smooth, long-lasting finish.
  • Protect surrounding areas and furnishings effectively before starting to paint.
  • Apply paint to interior surfaces correctly, following project requirements and safety guidelines.
  • Maintain and repair painted walls to keep them looking their best.
  • Spot new trends in paints and painting techniques to stay up-to-date in the industry.

Mastering these skills will help you deliver professional, high-quality results that impress clients and set you apart in the interior finishing trade!

5.1 Introduction to paints.

Paint is a liquid or paste coating that is applied to a surface in a thin layer and dries or cures to form a solid, continuous film that protects and decorates the surface. In interior design, paint is the most widely used and economical finish, able to change the mood, colour, light quality and character of a space quickly, while also protecting walls, ceilings, timber and metal from moisture, dirt and wear. Understanding what paint is made of and what each ingredient does helps designers specify the right product, judge quality and avoid failures such as peeling, fading or poor coverage. Example: when refurbishing a children's ward, a designer specifies a washable, low-odour paint with good opacity so that bright colours stay clean, cover well in two coats and are safe for young patients.

Functions of paint

  • Protection: Shields surfaces from moisture, corrosion, rot, insects and wear.
  • Decoration: Adds colour, sheen and effects that create the desired atmosphere.
  • Hygiene: Provides smooth, washable surfaces that are easy to keep clean in kitchens, toilets and hospitals.
  • Light reflection: Light colours reflect daylight and artificial light, making rooms brighter and reducing lighting costs.
  • Identification and safety: Colours mark hazards, pipes, fire equipment and walkways.
  • Concealment: Hides minor surface defects, patches and stains.
  • Value addition: Fresh, well-chosen paintwork improves the appeal and value of a property.

Composition of paint

Component Description Function
Pigment Fine coloured or white powder, such as titanium dioxide or iron oxide Gives colour and opacity (hiding power)
Binder (vehicle) Resin such as acrylic, alkyd or vinyl Binds pigment particles together and makes the film stick to the surface
Solvent or thinner Water or mineral spirits Makes paint liquid for application and evaporates as paint dries
Extenders (fillers) Inert powders such as chalk, talc or clay Add body, control sheen and reduce cost
Additives Small amounts of special chemicals Improve flow, drying, mould resistance and shelf life

Properties of good-quality paint

  • Good opacity: Covers the surface and previous colour in few coats.
  • Good adhesion: Sticks firmly without flaking or peeling.
  • Durability: Resists fading, cracking, chalking and wear.
  • Washability: Can be cleaned without losing colour or sheen.
  • Easy application: Flows smoothly without brush marks, drips or spatter.
  • Reasonable drying time: Dries quickly enough to recoat without trapping defects.
  • Low odour and toxicity: Safe for occupants during and after application.

Paint sheen levels

Sheen level Appearance Typical interior use
Matt (flat) No shine, hides surface defects Ceilings and living areas
Eggshell Very low sheen Bedrooms and lounges
Satin Soft, low shine Corridors, children's rooms, offices
Semi-gloss Noticeable shine Kitchens, bathrooms, doors and trims
Gloss High shine, very washable Doors, frames, railings and metalwork

Common paint terms

  • Spreading rate: The area that one litre of paint covers, measured in square metres per litre.
  • Opacity: The ability of paint to hide the surface beneath it.
  • Drying time: The time paint takes to be touch dry and ready for recoating.
  • Viscosity: The thickness or flow of paint.
  • Coat: One layer of paint applied to a surface.
  • Primer and undercoat: Preparatory coats that seal surfaces and help top coats adhere and cover.

Safe handling and storage of paint

  • Store in a cool, dry place: Heat and moisture spoil paint and can create fire risks.
  • Close tins tightly: Prevents skinning, drying and spills.
  • Keep away from children and food: Prevents accidental poisoning.
  • Ventilate when painting: Open windows and doors to reduce fumes.
  • Dispose of waste responsibly: Do not pour paint or solvents into drains or soil.

Worked example: pigment volume concentration

Pigment volume concentration (PVC) = volume of pigment and extenders ÷ (volume of pigment and extenders + volume of binder) × 100

A paint factory's matt emulsion batch contains 30 litres of pigment and extenders and 45 litres of binder by volume.

PVC = 30 ÷ (30 + 45) × 100

PVC = 30 ÷ 75 × 100

PVC = 40%, a value typical of a mid-sheen interior paint, since higher PVC gives flatter, less washable finishes and lower PVC gives glossier, tougher ones

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🔒5.2 Types of paints

Paints are classified by their base or carrier, by their function in a paint system and by special properties designed for particular surfaces or conditions. The main groups are water-based paints such as emulsions, solvent-based paints such as gloss and ename…

🔒5.3 Paint effects

Paint effects are decorative finishes created by applying, manipulating or removing paint and glaze to produce texture, pattern, depth or the look of another material, instead of a flat single colour. They are used to add character to feature walls, disguise u…

🔒5.4 Painting tools and equipment

Painting tools and equipment are the items used to prepare surfaces, apply paint, reach working areas safely and protect people and property during painting. They range from hand tools such as scrapers, brushes and rollers to powered equipment such as sanders…

🔒5.5 Colour schemes

A colour scheme is a planned combination of colours used together in a space, chosen so that walls, ceilings, woodwork, floors and furnishings look harmonious and create the intended mood. In painting work, the colour scheme decides which colours go on which s…

🔒5.6 Painting techniques

Painting techniques are the methods and hand skills used to put paint onto a surface evenly and neatly, mainly brushing, rolling and spraying, supported by skills such as cutting in, laying off, keeping a wet edge and feathering. The technique chosen depends o…

🔒5.7 Paint application

Paint application is the actual putting of paint onto prepared surfaces in the correct sequence of coats, at the right thickness and under suitable conditions, so that the finish adheres well, looks even and lasts. It involves choosing the right paint system f…

🔒5.8 Painting process

The painting process is the complete sequence of work in a painting job, from planning and preparing the site through surface preparation, applying the paint, inspecting the work and cleaning up at handover. Following the process in order ensures that nothing…

🔒5.9 Emerging trends on paint and painting techniques

The paint industry is changing in two main directions: paints are becoming safer and more sustainable, and painting is being supported by digital tools and automation. New products include bio-based, VOC-free, recycled and plant-based paints that reduce pollut…

🔒5.10 Repair and maintenance of painted surfaces

Repair and maintenance of painted surfaces is the regular care, inspection and correction of paintwork so that it stays clean, attractive and protective for as long as possible. Maintenance includes routine cleaning and touch-ups, while repair involves identif…

Chapter Practical Activities

Practical 1: Determine and Justify Appropriate Wall Finishes for a Residential Project

Interior Design · Level 6
Interior Design Finishing
PRACTICAL ASSESSMENT
TIME: 4 HOURS
⬇ PDFCandidate Instructions (Candidate Tool)

Type: Individual

INSTRUCTIONS TO CANDIDATE:
1.  You are required to perform the following task:
i.  Select and justify suitable wall finishes for a 60 square meter residential interior comprising living room, kitchen, bathroom, bedroom, and master bedroom as per provided project specifications and client requirements.
2.  You have been provided with the following resources for the practical task:
Tools & EquipmentMaterials
Measuring tape 5mSample boards of wall finishes: Vinyl paint, Wallpaper, Textured plaster, Ceramic tiles
Notebook and penColor swatch books for interior paints
CalculatorClient requirement questionnaire form
Computer with installed interior design softwareA3 size project specification sheet
⬇ PDFResources Required (Cutting List)
S/NItemQuantity
1A3 size project specification sheet1 Pc per Candidate
2Sample boards of wall finishes: Vinyl paint, Wallpaper, Textured plaster, Ceramic tiles4 samples per Candidate
3Color swatch books for interior paints1 set per 3 Candidates
4Client requirement questionnaire form1 Pc per Candidate
5Measuring tape 5m1 Pc per Candidate
6Notebook and pen1 Pc per Candidate
7Calculator1 Pc per Candidate
8Computer with installed interior design software (optional for presentation)1 Pc per Candidate
⬇ PDFAssessor Guide
Items to be EvaluatedMarks AvailableMarks ObtainedComments
TASK 1: Review project specifications and client requirements
Read and understood the project specification sheet
(Award 3 marks for thorough review)		3
Completed client requirement questionnaire accurately
(Award 4 marks for complete and relevant answers)		4
Measured and confirmed wall areas totaling approximately 60 square meters
(Award 3 marks for correct measurement and calculation)		3
Sub-Total10
TASK 2: Select appropriate wall finishes for each room
Selected suitable finish for Living Room considering aesthetics and durability
(Award 4 marks for appropriate selection)		4
Selected suitable finish for Kitchen considering moisture resistance and cleaning
(Award 4 marks for appropriate selection)		4
Selected suitable finish for Bathroom considering water resistance and hygiene
(Award 4 marks for appropriate selection)		4
Selected suitable finish for Bedroom considering comfort and client preferences
(Award 4 marks for appropriate selection)		4
Selected suitable finish for Master Bedroom considering luxury and client preferences
(Award 5 marks for appropriate selection)		5
Sub-Total21
TASK 3: Justify the choice of finishes
Provided clear justification for Living Room finish based on project and client needs
(Award 3 marks for relevant justification)		3
Provided clear justification for Kitchen finish based on project and client needs
(Award 3 marks for relevant justification)		3
Provided clear justification for Bathroom finish based on project and client needs
(Award 3 marks for relevant justification)		3
Provided clear justification for Bedroom finish based on project and client needs
(Award 3 marks for relevant justification)		3
Provided clear justification for Master Bedroom finish based on project and client needs
(Award 4 marks for relevant justification)		4
Sub-Total16
TASK 4: Present final selection in a clear format
Compiled a neat and organized wall finishes selection document
(Award 3 marks for neat presentation)		3
Included sample images or swatches for each finish selected
(Award 3 marks for inclusion and clarity)		3
Presented the wall finishes selection using interior design software or hand sketches (optional)
(Award 2 marks for clear presentation)		2
Sub-Total8
PRODUCT CHECKLIST
Final wall finishes selection document matches project specifications and client requirements
(Award 10 marks for completeness and accuracy)		10
All room finishes are practical, durable, and aesthetically appropriate
(Award 10 marks for suitability and creativity)		10
Wall finishes quantities and areas are correctly calculated and documented
(Award 5 marks for accurate measurements and calculations)		5
Sub-Total25
GRAND TOTAL80
ASSESSMENT OUTCOME:   ☐ Competent    ☐ Not Yet Competent (competent if at least 50%)

Practical 2: Select and prepare wall finishing tools and equipment for interior painting

Interior Design · Level 6
Interior Design Finishing
PRACTICAL ASSESSMENT
TIME: 4 HOURS
⬇ PDFCandidate Instructions (Candidate Tool)

Type: Individual

INSTRUCTIONS TO CANDIDATE:
1.  You are required to perform the following task:
i.  Select and prepare wall finishing tools and equipment required to paint a living room wall measuring 4,000mm by 3,000mm as per the given specifications.
2.  You have been provided with the following resources for the practical task:
Tools & EquipmentMaterials
3 inch flat paintbrush
6 inch paint roller with tray
1 inch angular paintbrush
Painter's tape
Sandpaper (medium grit 120)
Putty knife 50mm
Plastic drop cloth
Mixing container (plastic bucket 5L)
Cleaning cloth or rag
Mask
Dust coat
Measuring tape 5m
Pencil HB
⬇ PDFResources Required (Cutting List)
S/NItemQuantity
13 inch flat paintbrush1 Pc per Candidate
26 inch paint roller with tray1 Pc per Candidate
31 inch angular paintbrush1 Pc per Candidate
4Painter's tape5 meters per Candidate
5Sandpaper (medium grit 120)1 sheet per Candidate (230mm x 280mm)
6Putty knife 50mm1 Pc per Candidate
7Plastic drop cloth2.5m x 2.5m per Candidate
8Mixing container (plastic bucket 5L)1 Pc per Candidate
9Cleaning cloth or rag2 Pcs per Candidate
10Mask1 Pc per Candidate
11Dust coat1 Pc per Candidate
12Measuring tape 5m1 Pc per Candidate
13Pencil HB1 Pc per Candidate
⬇ PDFAssessor Guide
Items to be EvaluatedMarks AvailableMarks ObtainedComments
TASK 1: Preparation and selection of tools and equipment
Candidate wore Personal Protective Equipment (Mask and Dust coat)
(Award 3 marks for correct PPE usage)		3
Candidate measured and confirmed wall dimensions correctly (4000mm x 3000mm)
(Award 4 marks for accurate measurement)		4
Candidate selected appropriate paintbrushes and roller suitable for wall size
(Award 5 marks for correct tool selection)		5
Candidate prepared painter’s tape and masking to protect edges
(Award 4 marks for proper tape preparation)		4
Candidate prepared drop cloth to protect floor and furniture
(Award 3 marks for correct drop cloth usage)		3
Candidate selected sandpaper and putty knife for surface preparation
(Award 3 marks for appropriate surface preparation tools)		3
Candidate prepared mixing container and cleaning cloths
(Award 3 marks for readiness of mixing and cleaning tools)		3
Sub-Total25
PRODUCT CHECKLIST
All tools and equipment are appropriate and sufficient for painting a 4000mm x 3000mm wall
(Award 10 marks for completeness and appropriateness of selected tools and equipment)		10
Sub-Total10
GRAND TOTAL35
ASSESSMENT OUTCOME:   ☐ Competent    ☐ Not Yet Competent (competent if at least 50%)
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🔒Measure and Analyze Wall for Interior Painting FinishingPractical 3
🔒Estimate Wall Finishes Quantity for a Residential Room 5m x 4m x 3mPractical 4
🔒Prepare wall surface for finishing by cleaning, repairing, and priming a 3000mm x 2500mm wallPractical 5
🔒Apply paint finish to a 3m x 3m interior wallPractical 6
🔒Apply Decorative Wall Finishes on a 3m x 3m Interior Wall PanelPractical 7
🔒Clean finished wall surfaces 3000mm x 2500mm as per finishing standardsPractical 8
🔒Repair Damaged Wall Finishes in a 4m x 3m RoomPractical 9
🔒Maintain finished walls by repairing and repainting a 3m x 4m interior wall sectionPractical 10
Am I competent?

At the start of this chapter we promised you would be able to:

  • Analyse paint effects to match your client's preferences and vision.
  • Choose the most suitable painting techniques for different interior projects.
  • Identify and select the right tools and equipment for every painting job.
  • Prepare interior surfaces properly to ensure a smooth, long-lasting finish.
  • Protect surrounding areas and furnishings effectively before starting to paint.
  • Apply paint to interior surfaces correctly, following project requirements and safety guidelines.
  • Maintain and repair painted walls to keep them looking their best.
  • Spot new trends in paints and painting techniques to stay up-to-date in the industry.

Tick each one you can genuinely do.

So, are you there yet?

You're competent when you can confidently do 50% or more of what this chapter promised.

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← Ch 4: Install interior mouldings