---
title: "Functions of paint"
subject: "Civil Engineering Materials"
chapter: 9
key: "semester_3/civil_engineering_materials:functions-of-paint"
source: https://www.bctengineer.com/q/semester_3/civil_engineering_materials/functions-of-paint
site: BCT Engineering
---

# Functions of paint

Civil Engineering Materials · Chapter 9: Paint and Varnishes

- Asked in: 2081 Baisakh, 2 marks; 2075 Asoj, 1 marks; 2078 Kartik, 1 marks (asked 3 times)
- Video: [Components of Paints](https://www.youtube.com/watch?v=kyjYsKfEz88) — Engineering Motive
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_3/civil_engineering_materials/functions-of-paint
- Whole chapter: https://www.bctengineer.com/md/semester_3/civil_engineering_materials/chapter-9

## Question

What are the functions (significance) of paint in construction works?

## Short answer

Paint shields surfaces from moisture, prevents corrosion and rot, and provides decorative colour. It hides defects, eases cleaning, improves light reflection, and increases durability.

## Answer

Paint is a coloured protective coating applied in liquid form on a surface that dries to a hard film. Functions in construction:

1. **Protection:** Shields wood, steel and plaster from moisture, rain, sun, and chemical attack.
2. **Prevents corrosion and decay:** Forms a barrier against air and water, stopping rusting of steel and rotting of timber.
3. **Decoration:** Gives colours, smoothness and attractive finish to interiors and exteriors.
4. **Hides defects:** Covers minor surface irregularities and stains.
5. **Hygiene and cleaning:** A smooth film is easy to wash and does not harbour dirt or germs.
6. **Light reflection:** Light shades improve lighting inside rooms; special paints reflect heat.
7. **Special uses:** Marking and signs (road marking), fire-retardant, waterproof and anti-fungal coatings.
8. **Durability:** Increases the life of the structure and lowers maintenance cost.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. A key function of paint is to:
   A. Add weight
   B. Shield surfaces from moisture, sun and chemicals, preventing rusting and rotting
   C. Increase heat
   D. Replace plaster
   Answer: B. The film acts as a barrier against air and water. (Key point: Protection)

2. Paint also:
   A. Gives decoration and hides minor surface irregularities and stains
   B. Makes surfaces rougher
   C. Prevents all cracks
   D. Removes dirt
   Answer: A. It provides smooth colour finish and covers small defects. (Key point: Decoration and defects)

3. Which is a special use of paint?
   A. Road marking, fire-retardant, waterproof coatings
   B. Structural strengthening
   C. Producing electricity
   D. Making cement
   Answer: A. Special paints serve marking, fire retardance, waterproofing and more. (Key point: Special uses)

## Related in Civil Engineering Materials

- [Functions of mortar](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Afunctions-of-mortar) — Civil Engineering Materials, chapter 6, asked 8×
- [Stepwise preparation of cement mortar](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Astepwise-preparing-cement-mortar) — Civil Engineering Materials, chapter 6, asked 4×

## Related in other subjects

- [Lubricant functions and paint [partly illegible]](https://www.bctengineer.com/question.md?key=semester_2%2Fengineering_chemistry%3Alubricant-paint-partial) — Engineering Chemistry, chapter 8
- [Consultant and quality of construction works](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aconsultant-role-quality) — Construction Management, chapter 1
- [Significance of user defined functions](https://www.bctengineer.com/question.md?key=semester_1%2Fcomputer_programming%3Asignificance-user-defined-functions) — Computer Programming, chapter 6
- [Pointing, plastering defects, oil paint constituents](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Apointing-plaster-defects-paint) — Building Technology, chapter 9, asked 2×