Coatings are essential in many everyday products, but their complex, multiphase structures pose significant challenges for recycling, often resulting in coated materials being discarded in landfills. To advance sustainability, it is crucial to design coatings that not only perform effectively but can also be removed on demand without damaging the underlying substrate. Phosphate esters, known for their strong ability to bind to metal substrates, are effective as adhesion promoters in various industrial applications. In this work, we develop phosphate triester networks with β-hydroxy groups protected by o-nitrobenzyl photocleavable groups to create a removable coating for metal substrates. Inspired by the self-cleaving backbone structure of RNA, our group previously developed dynamic covalent networks based on phosphate triesters incorporating neighboring β-hydroxy groups, which are highly prone to hydrolytic degradation under mild conditions.1 In contrast, standard phosphate triester networks without these neighboring groups exhibit negligible hydrolysis at room temperature,2 due to a high energetic barrier to transesterification in the absence of β-hydroxy-mediated exchange via a cyclic intermediate. By adding a protecting group to the β-hydroxy groups, we design a coating that resists degradation during use but can be easily dissolved upon photodeprotection. Bis-alkene protected β-hydroxy phosphate triester monomers are synthesized and used to create versatile networks. This approach has significant potential to enhance the lifetime and recycling of metal substrates, offering a crucial step toward advancing sustainable practices in industries reliant on metal components.