A stabilizing fin that includes a hollow tubular element that has an upper surface for attachment to the bottom surface of a water planing device. The device comprises a compartment, such as a microcapillary tube, for holding the solution from which crystals are formed. , Ra and Rb are independently of each other C1-6 alkyl group, -L2-NR16R17, CH2O-L2-NR16R17, CN, -L2-N2NR16 or NR16R17, etc.