A composite product (1) comprises a solid wood component (10) and a coating layer (20) of a composite material on at least one side (12, 14, 16, 18) of the solid wood component (10), The composite material comprises cellulosic material and at least one polymer. An edge seal (30, 40) is applied to a short end (11, 13) of the solid wood component (10) and to at least a short end (22, 24) of the coating layer (20). The edge seal (30, 40) is attached to the short end (11, 13) of the solid wood component (10) and to at least the short end (22, 24) of the coating layer (20) and forms, with the coating layer (20), a protective barrier for the solid wood component (10).