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Hydroxypropyl methylcellulose (HPMC) in putty powder functions to increase viscosity, enhance internal adhesion, retain moisture, lubricate, thicken, and stabilize the powder.

HPMC increases viscosity and enhances internal adhesion, forming an invisible molecular protective film on the exterior of the powder to retain internal moisture, making the putty waterproof and preventing powdering. In addition to these functions, HPMC improves the durability and stability of the putty powder, preventing cracking and peeling, and forming a lasting adhesion to the wall substrate. Furthermore, HPMC prevents premature drying of the putty powder during application, allowing sufficient time for application and finishing. Adjusting the amount of HPMC added can create a uniform coating, making it easier to apply and dry on the wall. Hydroxypropyl methylcellulose plays a thickening and water-retaining role in putty powder. As a common water-soluble polymer, it plays a crucial role in putty powder.