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+--- Thread: How to Make Perfect Wall Putty with HPMC (/showthread.php?tid=34308)
How to Make Perfect Wall Putty with HPMC - hktkljn - 08-18-2025
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.
Why HPMC in Wall Putty?
- Water Retention – Prevents the putty from drying too fast, allowing cement to hydrate fully and improving bonding strength.
- Workability – Makes the mix smooth, easy to apply, and reduces drag on tools.
- Sag Resistance – Ensures the putty stays on vertical surfaces without slipping.
- Surface Finish – Produces a smooth, crack-free surface ready for paint.
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
Step-by-Step Process
- 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.
- Mix white cement and calcium carbonate thoroughly in a ribbon blender or similar mixer.
- Adding HPMC
- Pre-mix HPMC cellulose ether with a small portion of filler (CaCO₃) to prevent lumping.
- Ensure even distribution in the dry mix.
- Pre-mix HPMC cellulose ether with a small portion of filler (CaCO₃) to prevent lumping.
- Final Mixing
- Blend until the mix is uniform and free-flowing.
- Store in moisture-proof bags.
- Blend until the mix is uniform and free-flowing.
- 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.
- Add water gradually (≈ 35–40% by weight of powder).
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.
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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