Don't use latex
Latex Caulks (Acrylic & Vinyl) are adequate Architectural products, not suitable for use on a boat.Acrylic latex caulks are comprised of acrylic polymers, latex, water, and fillers. They bond very well to porous materials such as wood, masonry, plaster, and drywall in DRY areas. These caulks cure, or dry, as the water in them evaporates.They have no use on a boat.