The addition of wax seems to lower the bonding effect of the enzyme treatment (cf. Table 3). However, this does not correlate with the amount of laccase generated radicals as the level of radicals is similar for all enzyme treatments (Fig. 2). Detection of stable free radicals has been found to correlate well with the degree of laccase catalyzed oxidation [4]. Apparently the “wax coating” of fiber surfaces reduces the fiber–fiber interaction in the enzyme treated boards, and thereby the bonding effect. Similar observations on bonding mechanisms have been made [13] and [14]. For the combined wax and enzyme treatment the dimensional stability is not reduced as seen for the strength properties, this is most likely caused by the effect of the wax and to a lesser extent by the enzyme treatment. The “wax coating” in enzymatic bonding may be solved by changing the wax composition, e.g. applying it as granules or using a wax having a different surface energy, and thereby reducing the wetting of the lignin on fiber surfaces. Alternatively the possibility of using other methods for dimensional stabilization of the boards could be investigated, e.g. the wet-strength technology applied in the paper industry.