Impregnation of wooden boat is important to guarantee the decay resistance and longevity. We have made an absorption test of impregnating agents to see how VENDIA marine plank reacts with different impregnating agents. The test was made in accordance with Cobb-test, in which the impregnating agents were absorbed 168 hours (seven days) into the test materials. The test materials were normal structured 9 mm VENDIA (called evo1 in the pictures), 9 mm VENDIA Pro (called evo2 in the pictures) and birch plywood.
Phenol formaldehyde adhesive is the most commonly used glue in marine plywood. It is water-resistant and commonly used in plywood industry. Originally the phenol formaldehyde adhesive is colourless but effect of air and oxygen convert the phenol into brown. That is why the dark glue seams stand out in plank board joints and edges if wooden boat is made of normal marine plywood.