FINISHING

Painting & Coatings

Wall and ceiling painting

Also calledpaintingwall paintprimerputtyenamel
Definition

Painting in construction is the application of pigmented coating systems to building surfaces for protection, aesthetics, and durability. Indian Standards: IS 5410 (cement primer), IS 102 (lead-based paint specifications, now restricted), IS 8043 (industrial floor coatings), IS 156 (ready-mixed paint), IS 5411 (white-cement-based water paint). Major Indian paint manufacturers: Asian Paints, Berger, Nerolac, Kansai Nerolac, Akzo Nobel India (Dulux). The Indian paint industry is the second-largest in Asia after China, with ~₹85,000 cr annual revenue.

Main paint categories: (1) Emulsion (water-based) — most common interior wall paint; ₹150-500/L; 5-10 year service life; low-VOC and low-odour. (2) Enamel (oil-based) — for woodwork, doors, windows, metal; ₹250-700/L; 8-15 year service life; higher gloss. (3) Distemper (cement-based) — cheaper interior paint; ₹80-200/L; 3-5 year service life. (4) Texture paint — decorative finish; ₹350-1500/L. (5) Exterior paint — UV-resistant, weather-proof; ₹300-1200/L; 7-12 year service life. (6) Industrial paint — chlorinated rubber (tank lining), epoxy (chemical resistance), polyurethane (UV resistance), zinc-rich primer (anti-corrosion).

Application: (1) Substrate preparation — clean (dust-free, free of laitance), dry (moisture < 10%), primed. (2) Primer — cement primer for walls, alkyd primer for woodwork. (3) Putty filler — for surface imperfections; cured 24-48 hours before painting. (4) First coat — full coverage, allow 4-6 hours drying. (5) Second coat — applied perpendicular to first; allow 6-12 hours. (6) Final inspection — light reflected at low angle reveals defects; repair as needed. (7) Cure — 14 days for full cure before exposure to harsh conditions. The most-overlooked Indian painting issue: substrate moisture — applying paint to damp walls causes blistering and peeling within months. Walls should be dry (moisture meter <10%) before painting. Outdoor painting in monsoon should be avoided unless using specialty waterproof systems.

Typical values
Interior emulsion (residential)₹150-500/L
Exterior emulsion₹300-1200/L
Enamel (woodwork)₹250-700/L
Distemper (low-cost)₹80-200/L
Industrial epoxy₹500-2000/L
Coverage area (1 L emulsion)12-15 m² per coat
Service life (interior emulsion)5-10 years
Where used
  • Interior wall and ceiling finishes (emulsion paint)
  • Exterior wall finishes (weather-resistant emulsion)
  • Woodwork — doors, windows, furniture (enamel paint)
  • Metalwork — railings, gates (enamel + zinc primer)
  • Industrial — tanks, equipment, chemical-resistant coatings
Acceptance / threshold
Per relevant IS code + manufacturer specification: substrate preparation; primer; putty (if needed); minimum 2 coats; final inspection at low-angle light; service life per system.
Site example
Site reality: a Hyderabad residential project's exterior emulsion was applied in early September (still in monsoon). Within 4 months, blistering and peeling appeared on east-facing walls. Repair: removal of all paint, substrate drying, reapplication in dry weather. ₹2.4 lakh repair cost. Always plan exterior painting for dry season; monsoon-period painting requires specialty waterproof primer, slow-cure paint, and protective coverings.
Frequently asked
What is the best paint for exterior walls?
For Indian exteriors: 100% acrylic emulsion paint with weather-resistant additives. Major brands: Asian Paints Apex, Berger Weathercoat, Nerolac Excel. Service life 7-12 years. Apply over cement primer. For premium: silicone-modified acrylic — better dirt resistance and 12-15 year life. Avoid: distemper (3-5 year life only), enamel (yellows in UV).
How many coats of paint are required?
Standard: 1 coat primer + 2 coats finish paint (interior emulsion). For exterior: 1 coat primer + 1 coat intermediate + 1 coat final emulsion. For dark colours: extra coats may be needed (2-3 finish coats). For old surfaces with poor substrate: putty filler + primer + 2 finish coats. Each coat must dry fully (4-12 hours depending on conditions) before the next. Insufficient drying = blistering and adhesion failure.
Why does paint peel off walls?
Common causes: (1) Substrate moisture — paint applied to damp walls (60% of failures). (2) Substrate contamination — dust, oil, laitance on the wall (15%). (3) Inadequate primer — direct paint without primer (10%). (4) Application in extreme heat/cold (5%). (5) Wrong paint for substrate (5%). Prevention: substrate dry (<10% moisture), clean (water + brush), primed (cement primer for walls), application in moderate weather (10-30°C, RH < 80%).
Related finishing terms
Waterproofing
Damp proof course, membrane, coatings
Flooring & Tiling
Floor finishing — tiles, IPS, marble, granite
Grit Blasting / Surface Preparation
Surface preparation before painting/coating per IS 9012 / SSPC SP-10
Waterproofing Systems
Methods to prevent water ingress in roofs, basements, water tanks
False Ceiling
Suspended secondary ceiling for aesthetics, services concealment