Introduction to Paint Chemistry was first published in 1967 with~he intention of providing both a textbook for students and an introduction to the subject for those with little or no technical knowledee. This remains the objective. The book was completely revised in 1980, but the pace of change continued to quicken. In this third edition, I have sought to bring it up to date with the newest developments in the technology and, with an additional chapter, to emphasize the importance of the painting system as a composite, in which the substrate and its chemistry playa vital role. The book is divided into two parts. Part One begins at the very basis of matter-its atomic structure-and works step by step through a sufficient selection of chemistry and physics to allow any interested reader to cope with the chemistry and the technology of paint in Part Two. The reader should absorb as much of Part One as he or she feels necessary. It is worth noting, however, that the topics in it are specially selected from a paint point of view and that, for example, detail on oils in Chapter 3, on polymers in Chapter 5 and on light and colour in Chapter 6 could well be missing in some Chemistry degree courses.