**4. Conclusions**

Biopolymers are promising bio-based alternative to be used as biocides or barrierforming compounds into the structure of wood. Designing a coating system with better performance on wood depends on understanding the interaction among individual wood constituents with the coating components. By using biopolymers as coating additives to protect the wood has environmental benefits and avoids the issue of wood recycling. Lignin based coating shows great potential in the future as a promising alternative to fossil-based polymers.
