Hydroxypropyl Methylcellulose (HPMC) is a cellulose derivative widely used as a thickener, binder, dispersant, and emulsifier in a variety of applications. HPMC is a natural polymer, obtained from cellulose, which consists of repeating glucose units linked by β-1,4-glycosidic bonds. It is modified by introducing hydroxypropyl and methyl groups onto the cellulose backbone through a chemical reaction. HPMC is commonly used in the construction industry as an additive for wall putty. Wall putty is a cement-based product used for smoothening walls before painting or wallpapering. The use of HPMC for wall putty enhances its properties, such as adhesion, water retention, workability, and sag resistance. HPMC enhances adhesion by increasing the viscosity of the wall putty, allowing it to adhere better to the surface. Furthermore, HPMC reduces water loss, which prevents the premature drying of the wall putty and improves its bonding strength. The presence of HPMC also improves workability by improving the spreadability and reducing the tendency of the wall putty to crack or shrink during the drying process. HPMC also improves sag resistance in wall putty by increasing the viscosity and regulating the dispersion of the cement particles. This prevents the wall putty from sagging or sliding down the wall, particularly when applied on vertical surfaces. HPMC is preferred over other thickeners and binders due to its non-toxicity, water solubility, and compatibility with various types of cement. HPMC is also eco-friendly, as it is made from renewable resources and degrades naturally, making it safe for use in indoor and outdoor applications. Overall, HPMC is an essential additive in the formulation of wall putty, contributing to its improved performance, durability, and aesthetic appeal. Its use in the construction industry has gained significant importance and has become an indispensable part of any construction project where wall putty is used.