Stop water finding its way in through a bolted-on exterior fitting
Grab handles, roof vents, awning rails, roof lights, and other fittings bolted through the bodywork all rely on a seal around each fixing point to keep water out – and that seal cracks with age, vibration, and constant flexing as the vehicle moves.
Captain Tolley’s Creeping Crack Cure uses capillary action to seep into these cracks and seal them from the inside, without needing to unbolt the fitting or reseal it from scratch.
“I’ve waited since last November for a dry spell to carry out a repair on a rooflight frame. 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
“Been using this for a few years to make sure the awning rails on the caravan are well sealed. Dose them every second year. Dry as a bone.”
– David Finlayson, Judge.me review
*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. If you’re working in a garage or storage space, check if the air feels dry, not just that it’s out of the weather, and allow extra time to cure if it’s damp or unheated.
This works best on a true hairline crack or gap around the fitting – finer than about 0.8mm. If you can see a fine line but can’t fit a fingernail into it, it’s a good match. A fitting that’s loose, or a seal that’s visibly split or perished, will need refitting or replacing rather than sealing.
No – it’s designed to be applied directly around the visible fixing point, rail, or seal while the fitting stays in place.
Yes, once fully cured – apply it in a dry spell and give it a full day before exposing it to rain, so the sealant has time to set properly.
Exterior trim and mouldings flex with temperature changes and road vibration, opening fine cracks that let water track in behind the panels.
Caravan and motorhome shower trays are lighter than a home tray and flex with movement and changing temperatures, so hairline cracks in the sealant are common.
Rivets and fastenings loosen with age and vibration, leaving tiny gaps that let water creep in - a common issue on riveted trailers like Airstreams.
Riveted aluminium panels, seams and window seals all rely on a thin bead of sealant to keep water out, and that seal shrinks and cracks with age, letting water track in behind the shell.
