What is Mop?
Mast Base Sealing!
When the original seal degrades and water enters the sailboat, Mop is the most effective solution. Carefully manufactured from specific components, Mop replaces the worn mast base seal in minutes, without unstepping the mast. Installation is easy and ensures many dry years. Aesthetic and secure, Mop does not obstruct rope passages or pulley movement and does not hinder boat maneuvers. Furthermore, Mop can be easily removed and reinstalled if intervention on this part of the vessel becomes necessary. Tested in real conditions for several years, in both recreational sailing and offshore regattas, Mop has faced all types of conditions without failure and is now subject to a patent application.
Find the Mop that fits your boat
Why choose Mop for your boat?
Invented and designed by a sailor for our sailboats,
Mop is efficient, secure, durable, lightweight, economical, and aesthetic…
Mop is the ideal product for easily sealing your mast base
Made in Monaco
Designed, engineered, and manufactured in Monaco and its neighboring region, Mop offers all guarantees of quality and robustness.
Easy to install
Mop can be installed in place of your old seal in minutes, without the help of professionals or special tools. One Mop, your hands, less than 10 minutes… that's all.
Affordable price
Effective and durable protection at an accessible price for all sailors.
What our customers say
Great product
I benefited from one of the very first Mop prototypes. I have seen the evolution of this product, effective from the beginning, but always more aesthetic and robust. Today, I cannot conceive of any other solution for my mast base. Effective and robust. Bravo.
Alain
January 2026
It's perfect!
I had doubts… our gooseneck is very low on the mast, and I wasn't sure how it would adapt. A custom Mop solved the problem. It's perfect.
Philippe
March 2026
No issues, good product.
Farr 36
Benoit
March 2026
Beautiful and functional product
Not easy: A rather narrow carbon mast and a wide, rectangular base required a custom Mop. The team was attentive, and the product is beautiful and functional.
Louis Solaris 38
February 2026
With Mop, problems are solved
Our First 31.7 is a bit old but still valiant. Obviously, the seal at the mast base had degraded, and a lot of water was coming in. We tried everything: sticking tape, in several layers, injecting products, and even making a skirt that looked like Mop, without real success. With Mop, the problems are solved, and it's even much easier to install than an adhesive that has the bad idea of sticking everywhere during installation 😉
Eric First 31.7
March 2026
Mop speaks out
News, advice, and testimonials about safe sailing.
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Technical advice Sealing a keel-stepped mast: what are the mechanical constraints and limitations of the original seal? Read article
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Technical advice Replacing a Mast Step Seal: Is Unstepping the Mast Necessary? A Comparison of Solutions Read article
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Technical advice Maintaining a mast boot: checking its condition and preventing leaks Read article
Interested in our product?
Do not hesitate any longer!
Mop is the essential solution for sealing your mast base.
No more risky DIY fixes or costly mast unstepping; Mop is easily positioned, in no time, and will ensure watertightness for many years, regardless of conditions, your sailing program, and all latitudes.
Find the Mop that fits your boat
How does it work?
From measurement to sailing: 4 simple steps to equip your sailboat.
I determine
the model that fits my boat.
I order
online and receive the product quickly at home.
I install
the Mop myself using the installation guide.
I resume
my sailing with a light heart and dry feet.
Tutorial "Taking your measurements"
Tutorial "Installing your Mop"