🎨 Building Paint: Complete Q&A Guide for Civil Engineering (2026)
1. What is paint in construction?
Ans:
Paint is a liquid coating applied on walls, wood, or metal to protect and enhance appearance. It forms a thin film after drying.
2. What are the main components of paint?
Ans:
Pigment → Gives color
Binder → Holds particles together
Solvent → Helps in application
Additives → Improve properties
3. What is primer and why is it used?
Ans:
Primer is the first coat before paint.
Improves adhesion
Seals surface
Increases paint life
4. Difference between distemper and emulsion paint?
Ans:
Distemper → Cheap, not washable, low durability
Emulsion → Costly, washable, long-lasting
5. What is emulsion paint?
Ans:
Water-based paint with acrylic binder.
Smooth finish
Washable
Durable
6. What is oil-bound distemper (OBD)?
Ans:
Low-cost paint made from chalk, lime, and oil binder.
Used for temporary and budget projects.
7. What is putty in painting work?
Ans:
Putty is applied before paint to:
Smooth surface
Fill cracks
Improve finish
8. What is curing in painting?
Ans:
Curing means allowing paint to dry properly for better strength.
9. What are common paint defects?
Ans:
Peeling
Blistering
Cracking
Fading
Chalking
10. What is paint coverage?
Ans:
Area covered per liter of paint.
👉 Example: 8–12 sq.m per liter
11. Difference between primer and putty?
Ans:
Putty → Smooth surface
Primer → Helps paint stick
12. How many coats are required?
Ans:
1 coat primer
2 coats putty
2 coats paint
13. Drying time of paint?
Ans:
Touch dry: 30 min–2 hrs
Full dry: 6–24 hrs
14. Best paint for interior walls?
Ans:
👉 Emulsion paint
15. Paint for exterior walls?
Ans:
👉 Exterior emulsion
16. Safety precautions?
Ans:
Use gloves & mask
Proper ventilation
Safe scaffolding
17. What is enamel paint?
Oil-based paint for metal and wood with glossy finish.
18. Life of paint?
Ans:
Distemper → 2–3 years
Emulsion → 5–10 years
19. Can emulsion be applied over distemper?
Ans:
Yes, after proper surface preparation and primer.
20. Best weather for painting?
Ans:
Dry weather
15–35°C
Low humidity
21. What is wall putty?
Ans:
Cement/acrylic material for smooth finish.
22. Putty vs Primer?
Ans:
👉 Sequence: Putty → Primer → Paint
23. What is oil paint?
Ans:
Solvent-based paint with glossy and durable finish.
24. Advantages of oil paint?
Ans:
Durable
Water-resistant
Smooth finish
25. Disadvantages of oil paint?
Ans:
Strong smell
Slow drying
Not eco-friendly
26. What is texture paint?
Ans:
Paint giving 3D or rough finish.
27. Benefits of texture paint?
Ans:
Hides defects
Durable
Decorative
28. What is decorative paint?
Ans:
Paint for aesthetic designs like marble, metallic, stencil.
29. Texture vs Decorative paint?
Ans:
Texture → Rough finish
Decorative → Artistic design
30. Where is texture paint used?
Ans:
Exterior walls
Feature walls
Commercial buildings
31. Where is decorative paint used?
Ans:
Bedrooms
Hotels
Showrooms
32. Painting process (step-by-step)?
Ans:
Cleaning
Putty
Sanding
Primer
Paint
33. What is sanding?
Ans:
Process to smooth surface.
34. Role of thinner?
Ans:
Reduce thickness
Improve flow
35. Best paint for decorative finish?
Ans:
👉 Texture or decorative paint
36.What is External Texture?
Ans:
Decorative + protective coating for exterior walls.
Types:
Sand Texture
Roller Texture
Knockdown Texture
Spray Texture
Stucco Texture
Advantages:
Weather resistant
Long-lasting
Attractive
Thickness:
👉 1–3 mm
Cost:
👉 ₹40–₹120 per sq.ft
🟥 Red Oxide Primer
What is Red Oxide?
Ans:
Anti-corrosive primer for metal.
Uses:
Steel structures
Railings
Doors/windows
Types:
Metal primer
Floor coating
Red Oxide vs Primer
Ans:
Red oxide → Metal only
Primer → All surfaces
🎯 Primer Working
How Primer Works?
Ans:
Improves bonding
Seals surface
Reduces paint consumption
Types:
Cement primer
Acrylic primer
Red oxide primer
Wood primer
Without Primer:
❌ Peeling
❌ Uneven finish
❌ Low durability
🔥 Pro Tips
Use 2 coats of putty
Proper sanding required
Always apply primer
Maintain drying time
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