Silicone repair compound · an Amrize brandThe repair that does not wait for dry weather. A fibre-reinforced, moisture-curing silicone compound that bonds to damp surfaces — trowelled into cracks, voids, punctures, bolts and lap seams, with no fleece or scrim to bed in.
Fibre-reinforced siliconeThe three jobs it gets bought for, on roofs that are usually already wet.
A roof is leaking and the forecast is bad. GacoPatch bonds to a damp surface, so the repair happens now rather than after a dry spell.
Trowel-grade, so it stays where it is put around awkward details a brush-grade product runs off.
Step three of the silicone system: cracks over 6 mm and voids filled before the S42 field coat, so the membrane is never asked to span a gap.
What the data sheet actually gives you on site.
Most repair compounds need a dry substrate. This one does not — which is the whole point of it in an Irish winter.
Fibre-reinforced, so there is no separate fabric to cut, bed and encapsulate. One product, one operation.
Four to eight hours before the silicone top coat goes over it, so a repair does not cost you a day.
Compatible with every GacoFlex silicone coating, so the repair and the membrane cure as one — no dissimilar-material joint to fail later.
The facts that matter, straight from the product data.
| Type | Single-component, moisture-curing, fibre-reinforced silicone repair compound |
| Use | Cracks over 6 mm, voids, punctures, bolts and fixings, lap seams, emergency repairs |
| Substrate condition | Bonds to damp as well as dry surfaces |
| Application | Trowel-applied, high-build — holds its shape on verticals and details |
| Coverage | Approx. 18 linear metres at 50 mm wide per 3.78 L tub |
| Overcoat | 4–8 hours before a GacoFlex silicone top coat |
| Compatibility | All GacoFlex silicone coatings — metal, asbestos cement, aged bitumen, single-ply, EPDM |
| Manufacturer | Gaco — an Amrize brand. Duratite is the supplier in Ireland |
GacoPatch is step three. Skipping it is why coatings get asked to bridge gaps they were never designed to bridge.
Sollac Hipolava at 20:1, 10–15 minute dwell, rinse.
SF42 SeamSeal at laps, seams, upstands and penetrations.
GacoPatch into cracks over 6 mm, voids and punctures — damp or dry.
Only where needed — A4271 Bleed Trap on asphalt, primer on concrete.
S42 in a single coat to the warranty film build.
Free, no email required.
TDSGacoPatch Data SheetOfficial Gaco technical data PDFGacoPatch BrochureUses and application overview PDFS42 Flat Roof Application GuideWhere GacoPatch sits in the full system — 7-page guideTell us what the roof is doing and we’ll tell you whether it’s a patch, a detail, or a coating job — free, before you spend anything.
Tell us about your building and we’ll recommend the right system — foam, waterproofing or both — surveyed, specified and quoted at no cost.
