Interfacial bonding strength is critical to key structural functions in the laminar composite of different substrates bonded together by adhesives. This paper reports a study on utilization of the micro-porous composite structures of a hard-Australian jarrah wood to enhance the adhesive bonding with steel substrates. The thin adhesive joint between the two different substrates is rooted deeply into the micro-channels within the micro-porous composite structures of the jarrah wood using a unique resin pre-coating (RPC) technique. The mechanical abrasion of the substrates was carried out before RPC. Based on single lap shear tests, over 180% of improvement in shear strength was achieved after optimizing the concentration of RPC solution. One important observation was the wettability of substrates was enhanced by RPC as well. A non-destructive technique, X-ray tomography, was employed to reveal the microstructural details of jarrah wood, confirming the usefulness and effectiveness of RPC.