Significant acceleration in the speed of polydopamine coating is achieved by optimizing various physicochemical conditions. Using these conditions, sufficient amounts of polydopamine layers are deposited onto various surfaces within a minute. Moreover, the coating process is improved by combining it with a spray system, which allows the system to be used for large-scale surface modifications. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.