How to apply wall putty & precautions to take when applying putty

Published: 27 Jan 2022 | Modified: 28 Oct 2026

Quick Summary

To apply wall putty correctly, clean and dampen the wall, mix the putty to a smooth paste, and spread a thin first coat with a putty blade, then a second coat after it dries. Following precautions while applying wall putty, like avoiding thick layers and allowing enough wall putty drying time before painting, prevents cracks, flaking and uneven paint finishes later.

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TABLE OF CONTENTS

What precautions should I take when applying wall putty?

Wall putty is a wall and ceiling finish that is available in flexible varieties. When you are applying wall putty to your walls or ceilings, there are precautions that must be taken to avoid any problems with the wall or ceiling. Wall putty can be used on both interior and exterior walls of a building to provide them with a smooth surface before the application of paint. That is, this cement-adhesive ensures that the walls are free of any cracks, holes, and other imperfections, providing them with a perfect base for painting.

Also read: What is wall putty?

But the wall putty design process requires some special precautions to ensure that you get the best results possible:
What should I consider before applying wall putty?

Before wall putty is applied to your wall, there are some precautions to take:
1. Remove dirt from holes & cracks: If there are any cracks, holes, or imperfections on the wall surface, they should be cleaned first. Use a screwdriver to pick out dirt and debris from holes and cracks.
2. Clean the walls: Make sure your wall surface is clean and slightly wet before applying wall putty. Sanding is the preferred method to level out the concrete wall to smoothen the surface and level it out. The goal is to remove any loose or poorly adhered materials from the wall surface.
3. Mix putty with water in right ratio: you need to know the right mixture ratio if you are using cement wall putty. The general rule of thumb is two parts white cement putty and one part water (2:1). However, refer to the manufacturer's instruction. The goal is to get a peanut-butter-like consistency.
4. Apply first coat of putty: Let it dry for at least 6-8 hours (in case of cement putty). If you are using acrylic wall putty, the dry period is generally anywhere between 30 minutes to one hour.
5. Avoid overcoating: The maximum thickness of wall putty that should be applied to the wall is 1.5 mm. The thicker coating may lead to cracks and peel-off.
6. Apply a coat of primer: if you are using acrylic wall putty before applying a finishing coat.
7. Smoothen after wall is dry: use sandpaper and smoothen out the surface by removing any loose and small particles.
What should I remember before selecting a wall putty?
1. Cement Wall Putty: This type of wall putty is perfect for indoor walls and walls that are not directly exposed to the outside weather.
  
  Also read: What is cement putty?
2. Acrylic Wall Putty: This wall putty type is a good choice for both interior and exterior walls. It works well in both cold and hot temperatures, making it an ideal wall finishing material on exterior wall surfaces.
  
  Also read: What is acrylic putty?
Wall putty design — what are the best tips to get the best wall putty design?
1. Make sure your wall surface is clean and dry before applying wall putty
2. Apply the first coat of putty and let it dry for at least six to eight hours
3. Sanding is the best way to get a smooth surface
4. Ensure the cracks and holes are cleaned first before applying putty
5. If one coating isn't giving the effect, apply a second one
Also read: How to make walls alive & flawless with wall putty and what are the types of paint?
What is the difference between wall putty and white cement?
What’s the conclusion?

Wall putty is a versatile wall and ceiling finish that can be applied to interior and exterior walls. Try out Nerolac Acrylic Wall Putty and Nerolac Cement Wall Putty for the best results./p>

Key Takeaways

Always clean and lightly dampen the wall before starting putty application.
Mix putty in small batches and use it within its recommended working time.
Apply two thin coats rather than one thick coat to avoid cracking.
Allow each coat to dry fully before sanding with fine emery paper.
Respect the drying time before painting and always apply primer over putty.
Avoid putty on damp or seepage-affected walls until the moisture issue is fixed.

Nerolac Paints, a leading paint company in India offers a wide range of wall paint colours & painting services & solutions for homes & offices.

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FAQs

What are the steps to apply wall putty?

First scrape off loose paint and dust, repair cracks and lightly wet the wall. Mix putty with clean water to a lump-free, smooth paste. Apply the first thin coat with a putty blade in upward strokes, let it dry, then sand gently. Apply a second coat across the first, dry, sand again, wipe off dust and follow with a primer.

What are the steps to apply wall putty?

Most walls need two thin coats of putty for a smooth, even surface. The first coat fills pores and minor dents, while the second levels the surface and covers blade marks. Very uneven or old walls may need a third touch-up coat in patches. Avoid building up thick layers in one go, as heavy putty can crack or peel over time.

How long should wall putty dry before painting?

Each coat of putty usually needs several hours to dry, and the final coat should be left to dry thoroughly before sanding and priming. Drying slows down in humid monsoon weather, so allow extra time and keep the room ventilated. Always check the manufacturer's label, and never paint over putty that still feels cool or looks patchy in colour.

What precautions should be taken while applying wall putty?

Never apply putty on damp, oily or seepage-affected walls, as it will lose adhesion and flake. Mix only as much as you can use within the working time, and don't add extra water to revive hardened putty. Wear a mask while sanding, keep coats thin, and apply primer afterwards so the paint bonds evenly and doesn't absorb patchily.

What common mistakes should beginners avoid with wall putty?

Beginners often apply one thick coat to save time, which leads to cracks and uneven drying. Skipping sanding between coats leaves ridges that show clearly under paint. Another mistake is painting directly on putty without primer, causing patchy finishes. Also avoid working in direct harsh sunlight or rain, as rapid or slow drying weakens the putty layer.

Is wall putty needed for both interior and exterior walls?

Putty is most commonly used on interior walls to create a smooth base for emulsion paint. For exterior walls, use only putty specifically designed for outdoor use that can handle moisture and temperature changes. Many exteriors are instead finished with a suitable exterior primer and paint, or texture coats. Choose the right product for the surface and local weather conditions.