Sealant & Caulking Replacement in Toronto & GTA · Leak Prevention

Boat caulking & resealing in Toronto.

Old or cracked sealant is one of the fastest ways to get leaks and hidden water damage. We replace failed marine sealant and caulking the right way: removal, prep and a clean re-seal of hatches, portlights, windows and deck hardware, with a clear scope and honest recommendations.

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Sealant replacement
4 steps
  • Old sealant removed, not covered
  • Marine-grade sealant
  • Honest about what sealant can fix
★★★★★5.0 on Google · 33 reviews
★ 5.0 on Google · 33 reviews12+ years detailing boatsWe come to your marinaFree quote from photosOakville to ScarboroughShrink wrap from $23/ft · spring unwrap includedPolishing from $65/ftReal photos, real work
Quick answer

Boat caulking and resealing in one minute

What is boat caulking and resealing? It is removing old, cracked or failed marine sealant from joints, hatches, portlights, windows and deck fittings, cleaning and prepping the surfaces, and applying fresh marine-grade sealant so the joint bonds properly and helps keep water out.

What we reseal
Hatches and portlights, windows and frames, deck hardware and fittings, rails, cleats, antenna bases and seams with visible cracking or water entry.
Leak prevention
Fresh sealant fixes many common leaks, but some leaks come from hardware, frames or structure. We tell you before we start if resealing won’t solve it.
Price
Depends on the areas and access. Free quote from photos and location.
Where
At the marina or in the yard, from Oakville to the Scarborough Bluffs, planned around dock rules.
Pavlo, Toronto Boat Detailing
Written by Pavlo, founder of Toronto Boat Detailing, 12+ years detailing boats. Updated October 2026.

See all boat cleaning services and 2026 prices →

What’s included

What’s included in sealant replacement.

We focus on clean prep, proper adhesion, and marina-friendly work. Scope is confirmed after inspection.

Sealant Work (Core)

  • Inspect leak areas and failed joints
  • Remove old/failed sealant (as accessible)
  • Clean + prep surfaces for proper adhesion
  • Apply marine-grade sealant and finish clean edges

Common Areas We Re-Seal (Core)

  • Hatches and portlights
  • Windows / frames (where applicable)
  • Deck hardware and fittings (selected points)
  • Seams/joints that show visible cracking or water entry

Optional (Only With Approval)

  • Water test / targeted troubleshooting
  • Minor surface prep/cleanup around fittings
  • Spot touch-ups where prior work is failing nearby

Honest note: Some leaks come from hardware, damaged frames, or underlying structure, not just sealant. If re-sealing won’t fully solve it, we’ll tell you before we proceed.

Where boats leak

Where boats leak and what to check.

Signs that sealant has failed: water stains under a window, damp cushions, drips after rain, or cracked and lifting caulking you can see from the deck.

Hatches

Rubber seals and the frame bedding age; water runs in around the corners.

Portlights & windows

The most common cabin leak. Cracked sealant around the frame lets rain in.

Deck hardware

Cleats, stanchions, rails and fittings through the deck need sound bedding so water doesn’t reach the core.

Antenna & electronics bases

Every screw hole is a possible entry point if the sealant has aged.

Hull-to-deck joint & seams

Visible cracking or gaps along seams and joints.

Windshield frames

Older frames lose their seal and leak into the helm area.

Preventing Leaks the Right Way (Our Approach)

Fix the failure points, not just the symptoms.

We keep it simple and correct.

01

Identify likely entry points

Water stains, soft spots and cracked joints show where water gets in.

02

Remove failed sealant completely where possible

New sealant over old cracked sealant does not bond.

03

Prep surfaces for bonding

Clean, dry and free of old residue.

04

Re-seal cleanly and let it cure properly

Clean edges, and the joint left to cure before it is stressed or washed.

Boats We Service

Sailboats, powerboats and yachts.

SailboatsPowerboatsCruisersBowridersYachtsBrokerage boats

Sailboats, powerboats, and yachts, with a marina-friendly workflow. Marina-friendly workflow: we coordinate access and work cleanly around dock rules.

5.0 on Google · 33 reviews

Boat owners say it better.

Real reviews from our Google profile. Swipe or hover to read more. See all reviews on Google →

★★★★★Our company used them at the Toronto International Boat Show and their team is world class! They were more than willing to start at 5am and work late into the night to finish cleaning over 50+ products.
Emma MarcinkowskiToronto Boat Show · Google
★★★★★Pavlo and his team turned our oxidized dull looking 1991 CS34 into a sparkling masterpiece!
Sean M1991 CS34 · polish + decals · Google
★★★★★Pavlo and his team did bottom painting and hull polishing on our Hunter sailboat, and everything turned out amazing.
EvanBottom paint & polish · Google
★★★★★These guys are the ultimate professionals. Great communication, obvious expertise and experience and fabulous job. I would hire them again in a minute!
Mark StevensDetailing · Google
★★★★★I recently had my Sea Ray 550 detailed and ceramic coated, and I couldn’t be more impressed.
Edward GeorgeSea Ray 550 · ceramic · Google
★★★★★Pavlo and his team did an absolutely outstanding job detailing our Yamaha FX Cruiser.
Leonid RoyYamaha FX Cruiser · Google
★★★★★Boat sat all winter dirty and came out looking new after their great work.
Steve BamfordSpring clean · Google
★★★★★I asked for a sticker removal on my boat, and they went above and beyond by waxing, detailing, and thoroughly cleaning it.
Domenica RodriguezDecal removal · Google

Boat caulking and resealing across Toronto & the GTA.

No travel fee: Oakville and Bronte, all of Mississauga incl. Port Credit, Etobicoke, Mimico, Humber Bay, downtown Toronto and the Islands, East York, North York south of the 401 and Scarborough up to the Bluffs. Travel fee shown in your quote: North York north of the 401, Vaughan, Richmond Hill, Markham, Brampton, Pickering, Ajax, Whitby, Oshawa, Burlington, Hamilton, Guelph, Kitchener, Niagara, Barrie and Lake Simcoe. We also come to trailered boats, driveways and storage yards across the GTA.

Lake OntarioLake SimcoeOakville · BronteMississauga · Port CreditEtobicoke · MimicoDowntown & IslandsScarborough BluffsNorth York · Vaughan · Richmond HillMarkhamBramptonPickering · Ajax · WhitbyOshawa · ClaringtonBurlingtonHamiltonGuelph · KitchenerSt. Catharines · Port DalhousieNiagara-on-the-LakeBarrie · Lake SimcoePeterborough · KawarthasMuskoka & cottagesOrillia · Georgian BayTBD base · Etobicoke
No travel fee: Oakville & Bronte, all of Mississauga incl. Port Credit, Etobicoke, Mimico & Humber Bay, downtown Toronto & the Islands, East York, North York south of the 401, Scarborough to the BluffsTravel fee, confirmed in your quote: North York north of the 401, Vaughan, Richmond Hill, Markham, Brampton, Pickering, Ajax, Whitby, Oshawa, Burlington, Hamilton, Guelph, Kitchener, Niagara, Barrie & Lake Simcoe, PeterboroughBy arrangement: Muskoka & cottages, Orillia, Georgian Bay, Prince Edward County and beyond
76+ locations · Toronto & GTA

Marinas & yacht clubs we work at.

Don’t see your marina? If your boat floats in the GTA, text us and we’ll tell you. Subject to each facility’s contractor rules.

Downtown Toronto & Toronto Islands13 locations
  • Toronto Outer Harbour Marina
  • Harbourfront Centre Marina
  • Marina Quay West
  • Marina Four
  • Queens Quay West Marina
  • Polson Pier Marina
  • RCYC (Royal Canadian Yacht Club)
  • Queen City Yacht Club
  • National Yacht Club
  • Aquatic Park Sailing Club
  • Toronto Island Marina
  • Hanlan’s Point Marina
  • Keating Channel Marina
East Toronto & Scarborough9 locations
  • Ashbridge’s Bay Yacht Club
  • Ashbridge’s Bay Marina
  • Bluffer’s Park Marina
  • Bluffer’s Park Yacht Club
  • Cathedral Bluffs Yacht Club
  • Scarborough Bluffs Sailing Club
  • Water Rats Sailing Club
  • Toronto Hydroplane & Sailing Club
  • Highland Yacht Club
West Toronto & Etobicoke6 locations
  • Mimico Cruising Club
  • Humber Bay Park Marina (East & West)
  • Etobicoke Yacht Club
  • Lakeshore Yacht Club
  • Mooredale Sailing Club
  • Humber Bay Sailing Centre
Mississauga & Port Credit5 locations
  • Port Credit Harbour Marina
  • Port Credit Yacht Club
  • Lakefront Promenade Marina
  • St. Lawrence Park Boat Launch
  • Credit Village Marina
Oakville & Bronte5 locations
  • Oakville Harbour Marina
  • Oakville Yacht Squadron
  • Bronte Harbour Yacht Club
  • Bronte Outer Harbour Marina
  • Sixteen Mile Creek Public Docks
Burlington & Hamilton7 locations
  • LaSalle Park Marina
  • Burlington Sailing & Boating Club
  • Royal Hamilton Yacht Club
  • Hamilton Bay Sailing Club
  • Macassa Bay Yacht Club
  • Fifty Point Marina
  • Harbour West Marina
Pickering, Ajax, Whitby, Oshawa & Clarington9 locations
  • Frenchman’s Bay Marina (Pickering)
  • Frenchman’s Bay Yacht Club
  • Ajax Yacht Club
  • Whitby Marina
  • Port Whitby Marina
  • Oshawa Harbour Marina
  • Oshawa Yacht Club
  • Port Darlington Marina (Clarington)
  • Newcastle Marina
York Region & Lake Simcoe6 locations
  • Keswick Marina
  • Jackson’s Point Harbour
  • Pefferlaw Marina
  • Beaverton Yacht Club
  • Friday Harbour Resort Marina (Innisfil)
  • Barrie Marina
Niagara Region & St. Catharines5 locations
  • St. Catharines Marina
  • Port Dalhousie Pier Marina
  • Port Weller Marina
  • Niagara-on-the-Lake Sailing Club
  • Grimsby Yacht Club
Georgian Bay & beyond (by arrangement)7 locations
  • Port of Orillia
  • Lagoon City Marina
  • Penetanguishene Town Dock
  • Midland Bay Sailing Club
  • Bay Port Yachting Centre (Midland)
  • Parry Sound Town Dock
  • Sugarloaf Marina (Port Colborne)
Private docks & condo marinas4 locations
  • Toronto private docks (Harbourfront, Islands)
  • Condo marinas (Tip Top Lofts, Waterclub, Quay West and more)
  • Custom residential docks (Mississauga Rd, Bronte, Oakville, King City)
  • Trailered boats, driveways and storage yards across the GTA
FAQs

Boat caulking and resealing: your questions.

Can you guarantee no leaks after?
We can’t promise “zero leaks” without full diagnostics, but proper re-sealing fixes many common issues. If we think you need a different repair, we’ll say it.
How much does boat resealing cost?
It depends on the areas and access. Send photos + location and we’ll quote the scope accurately.
Do you work in marinas?
Yes, we plan around access and dock rules.
How do I know my boat needs resealing?
Water stains, damp cushions or lockers, drips after rain, and cracked, shrunken or lifting caulking around windows, hatches and fittings are the usual signs.
Do you reseal boat windows and hatches?
Yes. Hatches, portlights, windows and frames are the most common areas we re-seal.
Can you fix a leak that comes from the structure?
No. If the leak comes from damaged frames, hardware or structure, we’ll tell you and recommend a repair specialist. Cosmetic fibreglass work is covered under gelcoat repair.
When is the best time to reseal?
On a dry day in spring or fall, when the sealant can cure properly before the boat is used or wrapped for winter.
Guide

Boat caulking and resealing, in plain words.

Terms, explained

Boat caulking

Old marine caulking removed and replaced with fresh sealant.

Boat window resealing

Window and portlight frames re-sealed to help keep rain out.

Hatch resealing

Hatch frames and bedding re-sealed where water gets in.

Deck hardware rebedding

Fittings re-sealed so water doesn’t reach the deck core.

Marine sealant replacement

Failed sealant removed, surfaces prepped and a clean re-seal applied.

Leak prevention

Fixing failure points before hidden water damage starts.

Related services

Gelcoat repair

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Interior & odor removal

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Shrink wrap

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Seasonal prep

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All services & prices

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Boat care FAQ

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Free quote from photos

Water getting in? Send a photo.

Send photos of the leaking area, your boat length and marina. We quote the scope from photos.

  • Clear quote before any work starts
  • No travel fee from Oakville to the Scarborough Bluffs
  • Before and after photos

    Every service, one mobile team.

    Everything your boat needs, done at your marina by the same team.

    Shrink wrap: marina on Lake Ontario at sunsetShrink wrapFrom $23/ft, spring unwrap included→Shrink wrap prices: cruiser at a Toronto marinaShrink wrap pricesCalculator by boat type and length→Patio & equipment wrap: patio sectional shrink wrapped for winterPatio & equipment wrapPatio sets from $395, trailers, equipment→Gelcoat polishing: technician polishing a boat hullGelcoat polishingOxidation removal from $65/ft→Ceramic coating & wax: glossy powerboat hullCeramic coating & waxLong-lasting gloss and UV protection→Bottom painting: technician preparing a boat bottomBottom paintingPrep, barrier coat, antifouling→Acid wash: boat bottom after acid washAcid washHull & bottom, waterline stains→Hull & deck cleaning: boat deck at a Toronto marinaHull & deck cleaningAlgae, waterline stains, grime→Interior & odor removal: boat salon interiorInterior & odor removalCabin, upholstery, mildew, head→Gelcoat repair: gelcoat repair in progressGelcoat repairChips, cracks, worn areas→Teak cleaning: teak swim platform being cleanedTeak cleaningClean, brighten, protect→Canvas & enclosures: flybridge cruiser at a Toronto marinaCanvas & enclosuresClear vinyl and isinglass care→Engine bay & bilge: twin boat enginesEngine bay & bilgeDegrease, odor control→Decal removal: boat bow at the dockDecal removalOld graphics off, clean finish→Jet ski detailing: jet ski at the Toronto International Boat ShowJet ski detailingWash, polish, protect→Weekly cleaning: boat helm and steering wheelWeekly cleaningMaintenance all season→Pre-season prep: cruiser at the dockPre-season prepLaunch-ready, post-season cleanup→Pre-sale detailing: Sea Ray at a marinaPre-sale detailingPhoto-ready for listing→Gift certificate: gift box illustrationGift certificateAny amount, digital delivery→

    Dry cabin, clean joints.

    Send photos of the areas that leak or look cracked. We quote the scope and tell you honestly if sealant will fix it.

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