illustrated another embodiment of a system for continuously applying synthetic plywood patching material 20 comprising a static mixing tube 21 a cooling jacket 22 a cooling medium inlet 23 a cooling medium outlet 24 and compression fittings 25 the static mixing tube 21 has a resin inlet 27 a catalyst inlet 28 and a patching material outlet 29 heated resin and reaction catalyst enter through their respective inlets 27 28 at high pressure to be mixed in the static mixing tube 21 and once thoroughly mixed the homogeneous mixture of resin and catalyst exit through the patching material outlet 29 in order to be deposited on a plywood panel moving along a patch line one significant difference between the embodiment shown in fig2 and the embodiment shown in fig1 and that of fig2 and 2a is that the catalyst is fed into the mixing tube at catalyst inlet 32 and resin is fed into the mixing tube at location 33 such that the catalyst is not combined with the resin until it reaches location 31 significantly farther along the length of the mixing tube and closer to the patching material outlet 29 this configuration shortens the amount of time the resin and catalyst spend mixing together within the static mixing tube 21.