Dicor 551LSW non-levelling caravan roof sealant
Dicor 551LSW is a white, non-sag lap sealant for vertical caravan and motorhome roof joints. It is designed to hold its bead rather than flow flat, making it the practical choice for roof edges, side seams, termination rails and taller rooftop accessory flanges. For caravan owners in Auckland and across New Zealand, it provides a purpose-made alternative to general household silicone for compatible RV roofing systems.
The HAPS-free formula creates a flexible secondary seal and is UV-stabilised to resist deterioration and discolouration. It is compatible with EPDM, TPO and PVC roof membranes and adheres to aluminium, mortar, wood, vinyl, galvanised metal, fibreglass and concrete.
Choose non-levelling 551 or self-levelling 501?
| Application | Recommended sealant |
|---|---|
| Vertical seams, roof edges, termination rails and taller accessory flanges | Dicor 551LSW non-levelling, non-sag sealant |
| Horizontal roof areas, screw heads and low-profile vent flanges | Dicor 501 self-levelling roof sealant |
Use 551LSW where the sealant must stay where it is applied. Use self-levelling 501 only where the product can safely flow across a horizontal surface. Always confirm the roof manufacturer’s requirements before starting a repair.
Key features
- Non-levelling, non-sag formula for vertical surfaces
- White 10.3 fl oz cartridge, approximately 305 mL
- Compatible with EPDM, TPO and PVC roofing membranes
- Adheres to aluminium, mortar, wood, vinyl, galvanised metal, fibreglass and concrete
- UV-stabilised and formulated not to stain or discolour compatible roofing material
- Remains flexible after curing
- Applies with a standard caulking gun
- Available as a single tube, 12 pack or 25 pack
Pack options
| Pack size | Select Caravans SKU | Best suited to |
|---|---|---|
| Single | 551LSW-1 | One repair or a maintenance kit |
| 12 pack | 551LSW-12 | Workshop, fleet or larger resealing work |
| 25 pack | 551LSW-25 | Trade and high-volume maintenance |
Each cartridge contains white Dicor 551LSW non-levelling lap sealant. Tools and surface-cleaning materials are not included.
How to apply Dicor 551LSW
- Inspect the joint and remove dirt, loose paint, rust, oil, grease and failed or loose material.
- Check that the roof membrane, substrate and any existing sealant are compatible. Allow the surface to dry completely.
- Fit the cartridge to standard caulking equipment and apply a continuous bead to the vertical seam or edge.
- In cold conditions, bring the unopened cartridge to room temperature before use.
- Protect the repair while it skins and cures. Cure times vary with temperature, humidity and bead thickness.
Approximate cure times
Dicor lists the following approximate times at 10 to 20°C:
- 5 minutes: skins over
- 4 hours: waterproof
- 48 hours: 80% cured
- 30 days: fully cured
Specifications
| Manufacturer part number | 551LSW |
|---|---|
| Type | Non-levelling, non-sag RV roof lap sealant |
| Colour | White |
| Cartridge size | 10.3 fl oz, approximately 305 mL |
| Manufacturer-listed product weight | 1.2 lb, approximately 544 g |
| Manufacturer-listed dimensions | 11.25 × 2 × 2 in, approximately 286 × 51 × 51 mm |
| Application tool | Standard caulking gun |
Frequently asked questions
Is Dicor 551LSW suitable for a flat caravan roof?
It is intended for vertical or non-sag applications. For horizontal roof penetrations and screw heads, use the compatible Dicor 501 self-levelling sealant unless the roof manufacturer specifies otherwise.
Is Dicor 551 the same as ordinary silicone?
No. It is a specialist RV lap sealant formulated for compatible caravan and motorhome roofing materials. Do not assume household silicone is interchangeable.
Can I apply it over old sealant?
Inspect the existing bead first. Remove loose, contaminated or failed material, clean the area and confirm compatibility before applying new sealant. If the existing product or roof membrane is unknown, seek advice before proceeding.
How many tubes do I need?
Coverage depends on bead width, joint depth and the number of seams. Measure the repair area and allow extra for preparation, overlaps and future maintenance. The multi-packs suit workshops and larger resealing projects.
Browse caravan roof sealants, repair tapes and maintenance products for other New Zealand RV roof repair options.
Safety information
Flammable liquid and vapour. Keep away from heat, sparks and flame. Use with adequate ventilation and avoid breathing vapours. Wear suitable eye and skin protection. If swallowed, do not induce vomiting and seek medical advice immediately. If the product enters the eyes, rinse with water for at least 15 minutes. Keep the container closed when not in use. Read the product label and safety data sheet before use.
