How to Make Perfect Wall Putty with HPMC

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Wall putty is the foundation of a smooth, durable wall finish. To achieve excellent workability, water retention, and surface smoothness, HPMC (Hydroxypropyl Methylcellulose) is the key additive.

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Why HPMC in Wall Putty?

1. Water Retention – Prevents the putty from drying too fast, allowing cement to hydrate fully and improving bonding strength.
   
2. Workability – Makes the mix smooth, easy to apply, and reduces drag on tools.
   
3. Sag Resistance – Ensures the putty stays on vertical surfaces without slipping.
   
4. Surface Finish – Produces a smooth, crack-free surface ready for paint.
   

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General Wall Putty Formula (by weight)

• White Cement: 40–50%
  
• Calcium Carbonate (fine powder): 40–50%
  
• Polymers & Additives: 1–3%
  
• HPMC: 0.2–0.5% (depending on viscosity & grade)
  
• Optional Additives: Starch ether (for anti-sag), dispersing agents, defoamers, preservatives
  

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Step-by-Step Process

1. Dry Mixing
   • Mix white cement and calcium carbonate thoroughly in a ribbon blender or similar mixer.
     
   • Add other powder additives (except HPMC) and mix evenly.
     
2. Adding HPMC
   • Pre-mix HPMC cellulose ether with a small portion of filler (CaCO₃) to prevent lumping.
     
   • Ensure even distribution in the dry mix.
     
3. Final Mixing
   • Blend until the mix is uniform and free-flowing.
     
   • Store in moisture-proof bags.
     
4. On-Site Application
   • Add water gradually (≈ 35–40% by weight of powder).
     
   • Stir until smooth paste is formed.
     
   • Apply with a putty knife in thin coats (1–2 mm).
     
   • Allow each layer to dry before sanding/painting.
     

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Tips for “Perfect” Putty

• Choose HPMC viscosity between 40,000–60,000 cps for ideal water retention and smoothness.
  
• Use high-purity CaCO₃ for extra whiteness and smooth finish.
  
• Ensure consistent mixing – lumps mean uneven hydration.
  
• Control environmental factors – avoid direct sun during application.
  

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With the right grade of HPMC celluloses, your wall putty will have smooth spreadability, crack resistance, and a flawless finish ready for painting or coating.

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