Butyl based roof and gutter sealant that bonds and seals instantly. Black, rubberised and permanently weatherproof. Works on bitumen, felt, metal, asphalt and wood. Ideal for gutters, downpipes, flashings and roof sheet bedding.
QTY
Price
QTY
1
£1.79£2.15
12
£19.08£22.90
A reliable roof and gutter sealant is one of those things you don’t think about until you’re staring at a damp ceiling or a gutter pouring water down the fascia. This butyl based formula bonds fast and seals permanently, giving you a weatherproof result on the first go. No waiting around for a second coat, no hoping it holds through the next downpour. It goes on black, stays black, and stays put.
Butyl rubber has been used in roofing applications for decades, and for good reason. It stays flexible after curing, which matters on a roof where thermal movement is a constant factor. A rigid sealant will crack. This one moves with the substrate rather than fighting it, which is why it holds up over time rather than failing at the edges after the first hard frost.
Where Roof & Gutter Sealant Gets Used
This is a proper working sealant for roofing trades and maintenance work alike. It covers the jobs that come up again and again: leaking gutters, weeping downpipe joints, flashings that have lifted, roof sheets that need bedding down, and felt laps that have started to open. The black finish blends with most roofing materials without looking like a bodge job, which is always a consideration when working on visible roof areas.
Material Compatibility
The sealant adheres well to bitumen, asphalt, roofing felt, most metals including lead and aluminium, and timber. That covers the majority of what you’ll encounter on a standard pitched or flat roof job. Whether you’re re-bedding corrugated sheets on an agricultural building or sorting a leaking parapet gutter on a commercial premises, the same cartridge does the work.
At 310ml it fits a standard applicator gun, so there’s no faff with specialist equipment. For anyone doing regular roofing or maintenance work, the box quantity of 12 makes sense on cost. This is a straightforward roof and gutter sealant that earns its place in the van without needing much of an introduction.
Pro Tip: Apply this sealant to a dry, clean surface where possible, but if you're caught in the field with damp conditions, butyl will still bond where silicone typically fails, so it is a better choice than a general-purpose sealant for emergency repairs in wet weather.
This sealant is used across roofing, guttering and general weatherproofing maintenance. Roofers reach for it when bedding corrugated or profiled sheets, sealing felt laps, and fixing flashings back to masonry or timber. It handles leaking gutter joints and downpipe connections quickly, without the need to drain and thoroughly dry the area first. Builders and property maintenance teams use it for general roof repairs on both residential and commercial buildings, including flat roof edges, box gutters and parapet details.
Best For
Repairing leaking gutters and downpipes
Sealing and bedding roof sheets
Fixing and re-bonding roof flashings
Sealing felt laps on flat and pitched roofs
General weatherproofing repairs
Compatible Surfaces
Bitumen and asphalt
Roofing felt
Lead and aluminium flashing
Steel and other metals
Timber
Key Properties
Butyl rubber based formula
Instant weatherproofing
Permanently flexible when cured
Black rubberised finish
310ml cartridge fits standard applicator gun
Not suitable for: Not suitable for use on EPDM rubber membranes without confirming compatibility first, as some solvent-based sealants can swell or degrade EPDM. Not intended as a structural adhesive for load-bearing applications.
Load the 310ml cartridge into a standard skeleton or barrel gun. Cut the nozzle to the bead size you need and pierce the foil seal. Apply a continuous bead to the joint, lap or fixing area, pressing the substrate firmly into place immediately after application. The sealant grips quickly, so positioning needs to be right first time.
For gutter joints, clean away any loose debris and old sealant before applying. On flashings or roof sheet bedding, ensure the surface is free of dust and grease where possible. Tool the bead with a wet finger or spatula if a neat finish is needed.
Cut the nozzle tip to the required bead size using a sharp knife
Pierce the inner foil seal with the spike on the gun or a nail
Load the cartridge into a standard applicator gun
Clean the surface of loose debris, old sealant and any grease
Apply a continuous, even bead along the joint or fixing area
Press the components together firmly and hold or support until the initial bond grabs
Tool the bead smooth with a wet finger or spatula if a tidy finish is required
Will this roof and gutter sealant work on wet surfaces?
Butyl based sealants perform better in damp conditions than silicone or acrylic alternatives. It won't bond well to standing water, but damp or wet surfaces are generally manageable, which is why this type of sealant is a common choice for emergency roofing repairs.
Can this sealant be painted over once cured?
Butyl rubber can be difficult to paint over cleanly as some paints struggle to adhere to the cured surface. If painting is required, test compatibility first or use a primer designed for rubber-based substrates. In most roofing applications the black finish requires no further treatment.
Is this suitable for sealing around skylights and roof windows?
It can be used around the flashing and upstand areas of skylights where the sealant contacts metal or felt. Avoid applying directly to plastic frames or glazing seals without checking compatibility, as some butyl formulations can cause staining or react with certain plastics over time.
This sealant is formulated on a butyl rubber base, which gives it the flexibility and adhesion needed for roofing substrates that expand and contract with temperature change. Butyl chemistry is inherently resistant to UV degradation and moisture, making it well suited to permanent outdoor exposure. The black pigmentation is consistent throughout the product rather than surface only, so weathering does not affect the appearance over time.
Base
Butyl rubber
Colour
Black
Volume
310ml
Cartridge type
Standard applicator gun (skeleton/barrel)
Finish
Rubberised
Weather resistance
Permanent
Application temperature
Above 5°C recommended
Weight
N/A
Size
310ml
Box Quantity
1, 12
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