Fuse Rubberised Waterproofing Paint for Roofs and Wet Areas

If your roof is ponding water after every storm, or a wall keeps weeping damp no matter how many times you paint over it, you need a coating that actually moves with the building instead of cracking again in the same spot. That's the problem Fuse Rubberised Waterproofing Paint is built to solve. It's a flexible, rubberised coating designed to seal cracks, stop water ingress, and stay sealed through years of expansion and contraction, rather than just hiding the problem for a season.

This guide covers what the product is made of, where you can use it, how many coats it needs, the difference between the 5L and 20L options, and how it stacks up against other waterproofing systems like Sikalastic 560 and cementitious slurries such as Duraflex.

What is Fuse Rubberised Waterproofing Paint made of and how does it work?

Fuse Rubberised Waterproofing Paint is a rubberised, elastomeric coating. Once cured, it forms a flexible, seamless membrane over the surface rather than a rigid film. That flexibility is the whole point. Rigid coatings like old-style bitumen paints stay put until the substrate underneath moves, then they crack right along the joint or hairline fracture. A rubberised coating stretches with small movements in concrete, brick, or fibre cement, so it keeps sealing the surface instead of splitting open again in the same place.

Because it's applied as a liquid, it also fills hairline cracks and surface pores as it dries, building up into a continuous waterproof layer with no seams or joints for water to find its way through. That's a real advantage over sheet membranes, which rely on taped or welded joints that can fail over time.

Can Fuse Rubberised Waterproofing Paint be used on roofs, walls and wet areas?

Yes. It's a general-purpose rubberised waterproofing coating, commonly used across three broad categories of problem:

• Roofs, flat concrete roofs, corrugated sheeting and fibre cement roofs that are cracking, ponding, or letting water through at fastener points and laps.
• Walls, exterior walls exposed to driving rain, parapet walls, and boundary or retaining walls where moisture is pushing through from the outside face.
• Wet areas, showers, bathroom floors, and other consistently damp internal surfaces where a flexible waterproof layer is needed under tiling or as a standalone seal.

Take a flat concrete roof that's developed hairline cracks and ponding after summer storms. That's a typical case where a flexible rubberised coating outperforms a rigid bitumen patch, because it stretches with the slab instead of cracking again at the same joint. On a damp retaining wall, pairing a rubberised paint on the exposed face with a cementitious slurry below grade addresses both the visible symptom and the underlying moisture ingress, more on that combination below.

If you're dealing with damp coming up through masonry rather than in from a roof or exposed wall, that's usually a different mechanism. It's worth reading about fixing rising damp in walls before you reach for any waterproofing paint, since rising damp needs a different fix.

How many coats of Fuse Rubberised Waterproofing Paint are needed and how long does it take to cure?

For most roof and wall applications, two coats give you a reliable, continuous membrane. The first coat locks onto the substrate and seals surface porosity; the second builds thickness and evens out any thin spots the first coat missed. On rougher or more porous substrates, or where you're bridging fine cracks, a third coat adds extra reassurance.

Allow each coat to dry before applying the next. In warm, dry South African conditions that's typically a matter of hours rather than days, though humid or overcast weather will slow it down. Full cure, meaning the coating has reached its final flexible, waterproof state and can handle standing water or foot traffic, takes longer than surface-dry time. As a rule, don't expose a freshly coated roof to heavy rain or ponding until it's fully cured. Curing is weather-dependent, so it's worth reading about why timing your roof waterproofing matters before you plan the job around a specific date, especially if you're trying to beat the first winter rains.

What is the difference between the 5L and 20L Fuse Rubberised Waterproofing Paint?

The formulation is the same. The difference is coverage and who the pack size suits.

The Fuse Rubberised Waterproofing Paint 5L is the practical choice for smaller jobs: a bathroom wet area, a small section of parapet wall, a leaking gutter joint, or a homeowner patching one problem spot rather than re-coating an entire roof. It's priced around R327 and comes in Black, Grey, Terracotta and Red, so you can match or contrast with existing finishes.

The Fuse Rubberised Waterproofing Paint 20L is built for larger areas, full roof surfaces, boundary walls, or contractor jobs where buying in bulk works out more efficient than buying multiple smaller tins. It's priced around R999 and comes in the same four colour options: Black, Grey, Terracotta and Red.

If you're not sure how much coverage a given roof or wall needs, speak to the Pinnacle team before you buy. Under-ordering means a mismatched batch halfway through the job.

How does Fuse Rubberised Waterproofing Paint compare to Sikalastic 560 or cementitious waterproofing like Duraflex?

These are three different chemistries, and picking the right one depends on the surface and how exposed it is.

Fuse Rubberised Waterproofing Paint is a rubberised coating suited to general roof, wall and wet area waterproofing where flexibility and ease of application matter. It's a practical, cost-effective option for the roof, wall and wet-area jobs most property owners and contractors face day to day.

Sikalastic 560 liquid waterproofing membrane is a UV-resistant, liquid-applied elastomeric membrane engineered specifically for roofs, terraces and other exposed surfaces. If your job is a fully exposed roof or terrace that takes constant sun and weathering, and you want a coating built for that UV exposure, Sikalastic 560 is the more roof-specific choice. It's available in 5L (around R954) and 20L (around R3,616) sizes, in Gray, Terracotta, Charcoal and White.

Abe Duraflex waterproofing slurry, priced around R690 for a 15kg box, is a completely different animal: a cement-based slurry rather than a liquid-applied paint. It's the right tool for balconies, terraces, structural concrete, and below-grade or structural waterproofing where you need a hard, cementitious bond rather than a flexible film. On a damp retaining wall, for example, pairing a rubberised paint on the exposed face with a cementitious slurry below grade addresses both the visible symptom and the underlying moisture ingress, rather than relying on one product to do both jobs.

If cementitious systems are more relevant to your project, it's also worth comparing a cementitious alternative like Mapelastic Smart before deciding. And for a wider view of how these products fit into a full roofing job, roof waterproofing solutions in South Africa covers the broader system choices beyond a single coating.

What surface preparation is required before applying Fuse Rubberised Waterproofing Paint?

No waterproofing coating, however good, will bond properly to a dirty, flaking, or previously-coated surface that's breaking down. Preparation is where most coating failures actually start, not with the product itself.

Before applying Fuse Rubberised Waterproofing Paint:

• Remove old, failed coatings. If the surface has a previous paint or waterproofing layer that's peeling, bubbling, or chalking, it needs to come off first. Pinnacle's technical team routinely advises contractors on surface preparation, including using a stripping product such as Everbuild Cemstrip to remove old coatings and cement or mortar staining before re-waterproofing.
• Clean thoroughly. Dust, algae, and loose debris all stop the coating from bonding. Wash the surface down and let it dry fully before you start.
• Repair cracks and defects first. Fill any significant cracks, holes, or spalled concrete before coating. The rubberised paint bridges hairline cracks well, but it isn't a structural filler for larger defects.
• Check the surface is sound. Loose plaster, friable render, or crumbling masonry needs to be repaired or stabilised before you waterproof over it. Otherwise the coating will only be as durable as the surface underneath.
• Prime porous or powdery surfaces where needed. On very porous substrates, a bonding product such as Fuse Plaster Binder can help even out absorption before you apply the waterproofing coat, giving a more consistent finish.

Getting the prep right takes an extra afternoon. Skipping it costs you a redo within a year or two.

Getting the right waterproofing fix for your property

Fuse Rubberised Waterproofing Paint is a flexible, cost-effective way to permanently seal roofs, walls and wet areas against water ingress, provided the surface is properly prepared and the coating is applied in the right number of coats for the job. Pinnacle Construction Products stocks it in 5L and 20L sizes across Black, Grey, Terracotta and Red, alongside Sika, Mapei and ABE waterproofing systems, so contractors can match the coating to the substrate rather than settling for a one-size-fits-all fix.

For smaller repairs, the Fuse Rubberised Waterproofing Paint 5L is the practical starting point. For full roofs and larger wall areas, the Fuse Rubberised Waterproofing Paint 20L covers more ground per tin. If your job is a fully exposed roof facing constant UV exposure, weigh that up against the Sikalastic 560 liquid waterproofing membrane instead.

If you're still not sure which product fits your specific damp or leak problem, reach out to the Pinnacle Construction Products team for advice before you buy. A five-minute conversation about your substrate and exposure can save you from re-doing the job next winter.