On May 22, 2026, the coatings industry focused on adhesion theory and application of adhesion promoter technologies. With the diversification of substrates in modern coatings, low surface energy materials such as PP, PET and polyamide often suffer from insufficient paint film adhesion and peeling, which has become a pain point. Adhesion promoters, with the advantage of significantly enhancing interfacial bonding by small addition, have become core components of high-performance coatings. Their mechanisms include mechanical interlocking, chemical bonding, electrostatic attraction and molecular diffusion. Mechanical interlocking increases interface contact area; chemical bonding forms stable covalent bonds; electrostatic effect relies on double-layer attraction; diffusion theory realizes molecular interpenetration. For different substrates, promoters accurately match polarity of resin and substrate, optimizing wetting and reactivity to solve traditional adhesion defects. Driven by environmental and high-performance demands, adhesion promoters are upgrading to multi-functional and eco-friendly versions, widely used in plastic, metal and composite coating, boosting quality and technological breakthroughs of the coatings industry. For more information, please visit: https://www.tiktok.com/@mia_iota/video/7597717976720149782