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This study was attempted to investigate the coating effect of the wooden float. Three kinds (following A, B, C) of wooden pieces made of paulowania, Japanese cypress and birch being used commonly as the wooden float were selected, and five pieces were employed to each run as the test pieces. A. The wooden pieces dried in an oven for 3 hrs at 100°C after being cut into a dimension of 10×10×20mm3. B. The wooden pieces coated with synthetic resin paint five times for the test pieces-A. C. The wooden pieces impregnated, for 5 hrs under pressure of 5 atm by a compressor, with low condensation phenol resin which has resin content 20.2%, specific gravity of 1.060 and specific viscosity of 2.49, then coated by the same method as in the case of the test pieces-B. Table 1 shows the weight of synthetic resin which coated the test pieces-B and-C and of the resin impregnated in the test pieces-C. The test pieces treated by the above mentioned methods were then allowed to soak in the sea water the temperature of which was regulated at 30°C, and then absorption of water was measured by the increment of weight. The amount of absorbed water W after being soaked for t hours may be represented by the following emprical expression; W=WI(1-e-α1t)+WII(1e-α2t) where WI, WII, α1 and α2 are constant. The difference of the mode of absorbing process with the treatments can be seen in Fig. 1 and Table 2. 1. The coating effect of the test pieces treated only with synthetic resin paint or both the resin paint and the resin was effective distinctively as compared with the untreated ones. 2. An appreciable effect due to impregnation could not be seen, but this treatment caused shrinkage and warpping of the test pieces. 3. All the untreated test pieces sunk thoroughly within a month after soaking, but the treated ones were floating during three months under this experiment.

On the Coating Effect of Syntheitc Resin Paint for the Float