The Secret To HPMC Boosting Coating Adhesion: 3 Key Roles You Need To Know For coating formulators, adhesion is non-negotiable. It’s what keeps coatings stuck to substrates—no peeling, no flaking, no costly rework. When it comes to water-based coatings, one additive stands out as a quiet hero for better adhesion: Hydroxypropyl Methylcellulose (HPMC). It’s not a direct film