Stop water finding its way in through a cracked hatch or skylight
“We used this to waterproof the skylights of our narrowboat. It was easy to apply and did an excellent job.”
– Debbie Donovan, Judge.me review review
Deterioration of the seal between the frame and boat structure is a very common cause of leaks from hairline cracks in boats, particularly around hatches and skylights that are opened and closed regularly. Captain Tolley’s Creeping Crack Cure uses capillary action to seep into these cracks and seal them from the inside, without needing to remove the hatch or replace the seal.
Over time this loosens the fitting and opens fine cracks around its base, often invisible until water starts appearing below.
Captain Tolley’s Creeping Crack Cure uses capillary action to seep into these hairline cracks and seal them from the inside, without needing to remove or rebed the fitting.
“I’ve waited since last November for a dry spell to carry out a repair. The recent fine weather has let me try the Creeping Crack cure, and after a few showers it seems to have finally sealed a persistent drip.”
– William Spencer, Judge.me review
One customer had tried to stop a leak in a boat hatch for eight years with no success – this product finally fixed it, and he said he wished he’d known about it years earlier.
– Ray, verified Amazon customer
Another described it as easy to apply and said it “helped seal up several ports and hatches” on their boat.
– E. Hall, verified Amazon customer
*For best results, apply in dry conditions above 10°C / 50°F and keep the area dry while it cures. Cold or damp weather slows curing, and moisture can dilute the sealant before it sets, so allow extra time if conditions aren’t ideal.
No, the repair happens in situ. Captain Tolley’s goes onto the existing seal and into the hairline cracks in and around it, so the hatch and its current sealant stay in place. Make sure the area is clean and fully dry, and gently pick away anything loose or flaking that would stop the sealant reaching the crack.
The seal between the frame and the surrounding structure often runs deeper than what’s visible, especially where a metal or plastic frame meets fibreglass or wood. If it doesn’t seal on the first try, that’s usually why – simply reapply, and most seams are fully sealed within several applications.
Yes, once cured it stays flexible, so ordinary use of the hatch or skylight won’t crack the seal again the way a rigid filler might.
Let it cure fully before exposing it to water – applying it just before rain or in damp conditions can wash it out before it sets.
Deck fittings - chain plates, stanchion bases, cleats, winches, handrails, and deck fill pipes - are constantly stressed by rigging loads and movement underway, which loosens them and opens hairline cracks for water to enter the boat.
Coachroofs combine fibreglass, wood, and metal fittings that all expand and contract at different rates, opening hairline gaps along the joints and seams where water can track in.
Fine cracks frequently cause leaking where a portlight or window joins with the structure of a boat.
Model boats are just as prone to hairline cracking as full-size yachts, often from repeated knocks and handling.
