What is Boat Sealant?

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  • Written By: Desi C.
  • Edited By: Bronwyn Harris
  • Last Modified Date: 25 September 2019
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Boat sealant is used to patch and seal small cracks and leaks in a boat or other marine craft, such as a raft or tube. With normal wear and tear, small leaks can develop and damage can be caused by standing water, or from water rushing into a vessel. To prevent a small tear from developing into a large and costly problem, boat sealant can be applied to remedy the situation.

There are various types of boat sealants available on the market. The type of sealant that is chosen should be appropriate and effective for the type of boat. Some examples of boat sealant products include caulking, adhesives, epoxies, fasteners, polyurethane sealant, and teak care items. A small aluminum boat might need epoxy applied to seams and riveted areas, whereas an inflatable boat would need an adhesive that is specifically made for inflatable material.

In addition to choosing a sealant that will work for a specific type of surface or material, it is also important to properly prepare a surface for sealing. Some boat sealants will require a very clean surface in order for the leak to be sealed properly. Following directions and taking all necessary steps when using a boat sealant is required to ensure that the leak is properly fixed.


Boat sealant can be found at many boat dealerships, as well as at boating supply stores. Some sporting goods stores and departments will likely carry some type of boat sealant. The Internet is another good source for locating boat sealant; however, there is a wait time involved for shipping. Before making a purchase make sure that the sealant will meet the needs of your boat or water vessel, and that you will be able to allow ample time for the application and drying of the sealant.

One thing to look for when purchasing sealant is whether or not the product has a flexible quality to it. This is especially important with inflatable boats, as they consistently lose air, and are often completely deflated when not in use. Check the product details and specifications before applying an adhesive or sealant to an inflatable boat. If an improper product is used it could cause the material of the boat to stick together upon inflation. Furthermore, the sealant may not be flexible enough to withstand the various movements of the boat, should it travel in rough or fast moving water.


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