Therefore, the efficiency of ChD based coatings in improving the TI of solid board samples in this study is greatly limited by the hydrophobic character and low water absorption capacity of the substrate, which greatly reduces the amount of polymer that migrates into the internal structure of paper. Furthermore, the reduction of inter fiber bonding caused by repeated wetting and drying has an overall negative influence on the mechanical resistance properties. This effect previously demonstrated by Lavoine et al.32 in their study on the effects was of MFC surface coatings on paper.