It is therefore wise to regularly inspect fittings, drain plugs, hull penetrations, gunwales and other areas on board your where a solid and watertight construction is necessary.
Sealants for above and below the waterline
On this page you will find sealants and marine sealants for use on your boat.
It is important to check the product page to determine the application area of the relevant sealant, i.e. whether it can be used below or above the waterline, or both.
Biltema’s sealants and marine sealants are suitable for filling, jointing, and light glueing. You will also find all our available colours on this page. Our sealants allow for high elasticity – up to 25%.
Marine silicone
Do you need to seal hatches, joints, etc. above the waterline? Then you should choose our marine silicone, which is intended for use above the waterline. It creates permanent and waterproof joints, and adheres well to glass, fibreglass, metals and painted surfaces.
On the other hand, do you need sealant for your teak deck and caulking? Then you will find suitable teak sealant here for jointing between the decking planks.
MS polymer sealant
We also sell our popular sealant, which is based on MS polymer. This is a transparent sealant that can be used without primer on most materials on board. It can be used on wood, glass, plastic, aluminium, zinc, galvanised steel, stainless steel, and copper, as well as on other non-boat-related surfaces such as natural stone, concrete and tiles.
Our MS polymer sealant is for use above the waterline.
Tips and tricks for filling and sealing on boats
We have listed some important points for when you need to fill and seal on your boat:
- Remove the old filler and clean off well – Start by removing the old filler by carefully scraping or cutting it away. It is important to do this carefully to avoid damaging the fibreglass or the underlying material. Use a hard plastic scraper for best results. Once the old filler has been removed, it is a good idea to remove any residue with a silicone remover, which is a jelly-like substance containing citric acid. Make sure the area is completely dry and free of oils or other contaminants before moving to the next step. If the area is slightly porous, a primer should be used for optimal adhesion.
- Cover the area around your joint – It is crucial to use appropriate tape, partly to save time on subsequent cleaning of excess filler, but also to achieve a neat finish and to ensure mechanical durability against wear. A general rule is to place the tape approximately 1 mm inside the area to be filled, so that there is enough material for the joint to bond properly.
- Start jointing with the sealant – It is wise to wear rubber gloves when applying the sealant. Marine sealant is highly adhesive and can be difficult to remove from the skin. By wearing gloves, you also avoid dirtying the boat. Cut the tip of the cartridge to fit the area to be filled. After application, make sure to smooth out the joint and possibly use a filler stick to shape the joint as desired.
Also remember to read the safety data sheet for your product to find out which protective equipment you should use and anything else you should know before using our marine sealants.
