Abstract: A fluid injection method of nondestructive testing for bonding between two layers of material, at least one of which is penetrable is presented. One or two fluid injection members are inserted at selected locations along the penetrable material to the bond line between the materials. In the single injection member test, a fluid under known pressure is injected through the injection member to the bond line. The flow is measured at several locations and an average flow rate under satisfactory bonding conditions is noted. Any flow rates in excess of some fixed amount above this established norm is considered unsatisfactory. In the two injection member test. The two members are adjacently inserted through the material to the bond line and a fluid under known pressure is injected from one injection member to the bond line. If a disbond exists between the two members, the second member receives fluid from the first at the bond line.