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Non-Setting Strip Caulking Tape - Black / 13mm x 4.9m x 6.4mm
$23.95
Water entry can cause serious damage to a caravan, camper trailer or motorhome. A small failed seal can lead to swollen wall panels, damaged timber, stained lining and expensive hidden repairs.
This guide explains which caravan sealant to use, where each type works best, and what to check before sealing over a leak. The right product matters, but preparation and access for future repairs matter just as much.
Do not assume the water is entering directly above the wet area. Water can travel along roof framing, wall panels, wiring holes and trim before it appears inside.
Start by checking roof joints, corner moulds, windows, hatches, marker lights, awning brackets, aerials and any old screw holes. Look for cracked sealant, gaps, loose trim, lifted corners, staining, soft panels or sealant that has separated from one side of the joint.
If the leak is around a removable part such as a hatch, vent, window or corner moulding, the better repair is usually to remove the part, clean both surfaces and re-bed it. Smearing sealant over the outside edge may slow a leak briefly, but it often traps water or hides the real failure.
Good preparation is the difference between a repair and a temporary patch. Remove loose, cracked or contaminated sealant. Clean the surface so the new sealant bonds to the caravan, not to dirt, polish, old silicone, dust or moisture.
Preparation is also where colours should be checked. White, black, grey and clear sealants can still vary between brands and ages, so test the look before sealing a visible area.
Butyl mastic and strip caulking are non-hardening sealing compounds. They are useful where a part may need to be removed later, such as some older vents, trims and vintage caravan fittings.
Good butyl stays flexible under compression. Poor or aged mastic can dry, crack, run in heat or squeeze out, which lets water enter behind the fitting.
Neutral cure silicone is commonly used on the outside of caravans because it remains flexible and is suitable for many painted, powder-coated and aluminium surfaces. It is a better choice than acetic cure silicone for caravan body sealing.
Acetic cure silicone releases acid while curing. It can suit some glass and ceramic jobs, but it is not recommended for external caravan body joints because it can be unsuitable around painted surfaces, powder coating and soft metals.
Polyurethane and SMP sealants are often used where stronger adhesion or a paintable seal is needed. They can be useful around fibreglass panels, structural joints and permanent repairs, but the extra bond strength can be a disadvantage when a part may need to be removed later.
Some owners report polyurethane repairs drying or cracking after a few years. That can happen when the wrong product is used, the surface is poorly prepared, the joint moves beyond the product's limit, or the sealant is exposed in a way it was not designed for. Choose by chemistry and job, not just by brand name.
Doors and windows often rely on compression seals, foam tape, bedding tape or a shaped rubber seal rather than a simple bead of silicone. If the door or window still needs to open, do not fill the working gap with hard-setting sealant.
For a leaking door, window or hatch, identify the original seal style first. A failed rubber, foam or compression seal should normally be replaced with the right seal profile rather than covered in sealant.
For roof vents and roof vent fans, the correct repair depends on the vent design. Many replacements need the old vent removed, the roof cleaned flat, the new frame bedded on suitable sealing tape or sealant, and the screws sealed correctly. If the roof skin is cracked, hail-damaged or soft, repair the roof first before installing the vent.
Liquid rubber and roof coating systems are different from spot sealants. They can be useful for some roof restoration jobs, but they usually need a full preparation system and product-specific primer, coating thickness and curing conditions.
If the roof has widespread cracking, failed coating, hail dents, loose framing or soft panels, a tube of sealant will not solve the problem. Inspect the roof structure and repair damaged skin, fasteners and fittings before applying any coating.
For a full roof membrane or coating job, use a product designed for caravan or RV roofing and follow that manufacturer's system. If the van is valuable or water damage is already present, professional inspection is usually cheaper than guessing.
Can I just seal over the old sealant?
Usually no. If the old sealant is cracked, loose, dirty or wet underneath, new sealant will only stick to the failing layer. Remove failed material and clean the surface first.
Should I use silicone or polyurethane on a caravan?
It depends on the joint. Use neutral cure silicone for many flexible external body seals. Use polyurethane or SMP where a stronger, more permanent or paintable joint is needed. Do not choose polyurethane just because it sounds stronger.
Is acetic cure silicone OK on caravan body joints?
No, not for general external caravan body sealing. Use a suitable neutral cure caravan or glazing silicone instead, especially near aluminium, painted surfaces and powder coating.
What sealant should I use when replacing a roof vent fan?
Usually a suitable bedding tape, butyl/strip caulking or neutral cure caravan sealant is used under the vent frame, depending on the vent design and roof surface. Remove the old vent, clean the roof, repair any damaged screw holes or roof skin, and follow the vent manufacturer's instructions.
What should I use for doors and windows?
Use the correct seal profile, foam tape, bedding tape or compression seal for that door or window. Do not block an opening joint with silicone if the door or window needs to keep moving.
Can sealant fix hail damage?
No, not properly. Sealant may temporarily stop a small exposed hole, but hail damage can crack paint, stretch metal, loosen fittings and damage the roof structure. Inspect and repair the damaged roof before relying on sealant.
Can I use liquid rubber on a caravan roof?
Yes, sometimes, but treat it as a roof coating system, not a quick sealant bead. The roof must be sound, clean and prepared exactly as the coating manufacturer specifies.
How do I replace a rubber seal in a top vent?
Identify the vent brand and model first, then match the replacement seal or lid parts. A failed compression seal is usually replaced, not covered with sealant.
Can I smooth sealant with soapy water?
Only if the sealant instructions allow it. Some products can be affected by soap, moisture or solvent during tooling. The safest answer is to follow the product's data sheet.
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