When you need to provide a seal between two surfaces on your boat, there are a few options that can be used. Marine sealants, unlike glues, dry to a tough, flexible material that can withstand movement between the two surfaces. Marine caulk also for some flexibility which creates a longer-lasting seal. OC Boat Supplies carries a large inventory of sealant products from the top brands in boating industry.
Make sure when you are selecting the marine caulk or sealant for your job that it is marine grade. This will ensure that it will keep moisture out and prevent damage like corrosion or rotting. Also, when selecting the right product, you will want to make sure you know what you are trying to bond together. Different materials work better with different types of sealants. For an all-purpose marine sealant great for use above the waterline, the 3M 5200 Polyurethane Fast Cure Adhesive is a great option. It bonds with almost all materials and works great for sealing holes and deck fittings.