When it comes to wall finishing, two names often dominate the discussion: Plaster of Paris (POP) and wall putty. Both materials are widely used in construction and interior design, but they serve different purposes. POP is mainly decorative, while putty ensures durability and a smooth surface for painting.
If you are planning a new home or renovating an existing one, understanding POP vs putty will help you choose the right material for your walls.
What is Plaster of Paris (POP)?
Plaster of Paris is made by heating gypsum at around 150°C, which removes water molecules and produces a fine powder. This powder, when mixed with water, sets quickly into a hard surface. Its white finish, light weight, and ability to be moulded into shapes make it a favourite for designers and contractors.
Common Uses of POP:
- False ceilings and cornices
- Wall panelling and decorative mouldings
- Textured wall surfaces
- Repair work for small cracks in plaster
Properties of POP:
- Setting time: 5–10 minutes
- Lightweight and easy to spread
- Aesthetic finish but less durable than putty
- Not water-resistant
What is Wall Putty?
Wall putty is a cement-based or acrylic-based finishing material applied before painting. It acts as a protective base coat that evens out imperfections and ensures that the paint adheres properly. Unlike POP, putty is tough, long-lasting, and resistant to moisture, which makes it ideal for both interiors and exteriors.
Types of Wall Putty:
- White Cement-Based Putty – Made using white Portland cement, minerals, and polymers. Strong, water-resistant, and widely used.
- Acrylic Putty – A ready-to-use paste form. Easy to apply, suitable for interiors, but less durable than cement-based putty.
Properties of Putty:
- Setting time: 30–60 minutes
- High compressive strength
- Smooth and uniform finish
- Prevents flaking and peeling of paint
POP vs Putty – Key Differences
| Feature | POP (Plaster of Paris) | Putty |
|---|---|---|
| Main Ingredient | Gypsum | White cement + polymers |
| Primary Use | Decorative work (ceilings, mouldings) | Base coat before painting |
| Durability | Low, weak in dampness | High, water and weather-resistant |
| Application Area | Indoors only | Indoors and outdoors |
| Finish | Very smooth, artistic | Smooth, strong, paint-ready |
| Moisture Resistance | Not resistant | Resistant |
| Maintenance | Needs frequent care | Low maintenance |
| Cost | Cheaper | Slightly costlier but long-term savings |
Advantages of POP
- Highly workable and mouldable for artistic designs
- Smooth and premium finish
- Quick setting saves time during interior decoration
- Lightweight, making it easy to apply
Disadvantages of POP
- Not suitable for moisture-prone areas
- Weak compared to putty
- Cracks may develop over time
- Limited to indoor use only
Advantages of Putty
- Strengthens wall surfaces
- Provides a smooth, even finish for paints
- Long-lasting and weather-resistant
- Works well in humid or damp areas
- Improves paint adhesion and life
- Easy to apply with less skilled labour
Disadvantages of Putty
- Slightly more expensive than POP
- Drying takes longer compared to POP
- Cannot create decorative moulds like POP
When Should You Use POP?
- For false ceilings in living rooms and bedrooms
- To create cornices, arches, and decorative panels
- When you want a smooth, aesthetic indoor finish
- For minor plaster crack repairs in dry areas
When Should You Use Putty?
- Before painting any wall or ceiling (essential)
- On exterior walls exposed to rain and sun
- In kitchens, bathrooms, or damp areas
- To cover cracks, holes, and uneven wall surfaces
- To increase paint life and prevent flaking
Expert Tips for Best Results
- Surface preparation: Clean the wall thoroughly before applying putty or POP to remove dust and grease.
- Curing: Cement-based putty requires light curing with water for durability, while POP does not need curing.
- Number of coats: Two coats of putty are ideal; POP usually requires a single coat for decorative work.
- Combination use: Use POP for design and putty for paint preparation to get the best of both.
IS Codes Related to POP and Putty
- IS 2547 (Part 1 & 2): 1976 – Gypsum building plaster (POP standards)
- IS 8042: 2015 – White Portland cement (used in cement-based putty)
- IS 13095: 1991 – Guidelines for non-structural wall finishes
- IS 15477: 2019 – Specifications for wall finishing and coating materials
POP vs Putty: Which is Better?
If your goal is aesthetic design, POP is the winner. It is perfect for ceilings, panelling, and ornamental work.
But if your priority is durability and wall strength, then putty is the better option. It prepares walls for paint, resists dampness, and ensures a longer life for your finishes.
Many professionals recommend using both – POP for interiors and decorative work, followed by putty for wall smoothness and durability.
Conclusion🎯
Both POP and wall putty are essential in construction but serve different roles. POP enhances beauty, while putty ensures durability and paint quality. For the best outcome, use POP for decorative finishes and wall putty for a smooth, protective base. By combining the two, you can achieve both elegance and longevity in your interiors.
FAQs on POP vs Putty
Q1: Can we paint directly without putty?
Yes, but it is not advisable. Without wall putty, the paint may not last long and could peel or flake.
Q2: Which is cheaper, POP or putty?
POP is cheaper, but putty offers better value in the long run due to its durability.
Q3: Can putty replace POP?
No. While putty strengthens walls, it cannot create decorative mouldings like POP.
Q4: How long does putty last?
Good quality cement-based wall putty can last 8–10 years if applied properly.
Q5: Can POP be used in bathrooms?
No, POP is not moisture-resistant and should not be used in wet areas.
Q6: Is curing needed for putty?
Yes, light curing is needed for cement-based putty to gain strength.