Epoxy quickly dry mastic (6 hours at 23°C), specially elaborated for leisure boat application, waterproof, can be used under waterline. Without any solvent, it's no subject to shrinkage.
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.