Which Selleys roof and gutter sealant do you need, and how do you choose?

Five products sit in the Selleys roofing silicone range, and they are all for the same broad job — stopping water getting in at a roof or gutter joint. The choice between them turns on two practical questions rather than on performance claims: will the surface be wet when you get to it, and how are you going to apply it.

Those two questions matter more on a roof than anywhere else in the sealant range, because roof leaks make themselves known in bad weather and roof access is awkward. A product you can apply to a wet surface, or spray into a position a caulking gun cannot reach, changes whether the repair happens today or waits.

What this category covers

The product listing on the live category page is loaded dynamically and could not be captured, so this page is built from the five products the live sitemap lists under this path. They cover general roof and gutter sealing, leak repair, a sprayable option and a trade product.

How to choose

If the surface is wet, or it is still raining

This is the first thing to settle. Selleys Storm Sealant delivers an immediate waterproof seal on any building material, wet or dry, indoors or outdoors. Selleys Roof & Gutter Spray Seal is described as easy to apply and as working on wet surfaces.

Those two are what you reach for when the leak is active. The remaining three should be treated as conventional sealants wanting a clean, dry substrate unless their own product pages say otherwise — and a silicone applied to a wet surface that was not formulated for it will not bond, which produces a repair that appears to have worked until the next downpour.

If a caulking gun will not reach

Roof & Gutter Spray Seal is the sprayable product in the range, described as a quick and easy fix for roof and gutter leaks. A spray gets into positions a nozzle cannot — the back of a gutter, a lap under a sheet, a joint you cannot get a straight line on.

If you want a neutral, non-acid silicone

Selleys Roof & Gutter Speed Seal is described as ideal for repairing leaks in most forms of roofing and guttering, and specified as a neutral (non-acid) 100% silicone offering superior adhesion and resistance to lifting.

Neutral cure is worth understanding on a roof specifically. Roofing is largely metal — sheeting, flashings, gutters, fixings — and a non-acid silicone does not release acid onto those surfaces as it cures. Resistance to lifting is the other half of the specification: a bead that peels away at one edge stops sealing while still looking present, which is the failure mode that lets a leak return without any visible sign of it.

For general roof and gutter work

Selleys Roof & Gutter Silicone keeps roofs and gutters leak-free with a water-tight seal that resists cracking and shrinking. It is the general-range product for routine sealing.

For trade and specification work

Selleys Pro Trade Roof & Gutter Silicone is designed for general purpose roof and gutter and weather sealing where excellent adhesion and long-term reliability are required. That framing — long-term reliability as a stated requirement — points at work where the seal has to be right the first time because returning to it is expensive.

The products in this range

• Selleys Roof & Gutter Silicone — a water-tight seal that resists cracking and shrinking, for keeping roofs and gutters leak-free.
• Selleys Roof & Gutter Speed Seal — neutral, non-acid 100% silicone with superior adhesion and resistance to lifting, for repairing leaks in most forms of roofing and guttering.
• Selleys Roof & Gutter Spray Seal — quick and easy sprayable fix for roof and gutter leaks, works on wet surfaces.
• Selleys Storm Sealant — immediate waterproof seal on any building material, wet or dry, indoors or outdoors.
• Selleys Pro Trade Roof & Gutter Silicone — general purpose roof, gutter and weather sealing where excellent adhesion and long-term reliability are required.

The safety divide in this category — the aerosol is a different order of product

Four of these five come out of a cartridge and one comes out of a can, and that single difference accounts for almost all of the hazard separation in the category.

Group	Products	Classification
Aerosol	Roof & Gutter Spray Seal	Danger. H223 flammable aerosol, H229 pressurised container may burst if heated, H336 may cause drowsiness or dizziness, H319 serious eye irritation, H315 skin irritation. Dangerous Goods Class 2.1, UN 1950, by road, rail, sea and air
Cartridge sealants	Pro Trade Roof & Gutter Silicone, Storm Sealant	Warning. Pro Trade: H317 skin sensitisation Category 1, H315 skin irritation, H227 combustible liquid — a C1 combustible under AS 1940 for storage. Storm: H317 skin sensitisation Category 1, H319 serious eye irritation. Neither is Dangerous Goods
No classification published	Roof & Gutter Silicone, Roof & Gutter Speed Seal	No hazard classification appears on either product page. That is missing data, not a finding of “not hazardous” — check the pack and the safety data sheet

The dangerous part of Spray Seal is the can, not the sealant. Every cartridge beside it on the shelf is undeclared for transport. Put the same job in an aerosol and you add butane and propane at up to 30% each, plus cyclohexane at up to 30% as solvent — on the stated ranges, as much as ninety per cent of what leaves the nozzle can be flammable hydrocarbon that then evaporates around you. No grinder, no hot works, no soldering iron and no cigarette anywhere near where you are spraying or where the vapour is draining to, because vapour from these gases is heavier than air and runs downhill along a gutter and into a roof cavity.

H336 — drowsiness or dizziness — is the classification that deserves the most respect on a roof, because of where this product gets used. A box gutter, a skylight well, the underside of an eave or a roof cavity is a confined space with a person in it, and the method is two thick coats from 30 cm, which holds your face in the plume for a sustained period. Impairment is a fall risk before it is a health risk. Ventilate, spray with the wind behind the work, wear eye protection, and use a respirator where you cannot get real air movement. H229 is the sleeper alongside it: the can must not go above 50°C, and a dark metal roof in summer, a ute tray and a closed vehicle all pass that comfortably.

On the cartridges, the hazard is your hands. Both classified cartridge products carry skin sensitisation at Category 1: the immune system learning to react, generally permanent once acquired, triggered thereafter by far smaller exposures and worse with each one. It builds from repeated ordinary contact, which is what tooling flashings and gutter seams bare-fingered amounts to, job after job. Storm Sealant is the worst case for it, because the emergency it exists for is exactly the moment nobody stops to put gloves on. Keep a pair in the same bag as the cartridge.

Comparing the five on the numbers that decide the job

Product	When it can take water	Movement capability	Service temperature	Potable water
Speed Seal	Rain-ready in about 1 hour	±25%	Approximately –60°C to +150°C	AS/NZS 4020
Spray Seal	Rain-ready in about 2 hours; paintable after about 24 hours	See product page	See product page	AS/NZS 4020
Roof & Gutter Silicone	Skin time 5–10 minutes, tack-free 30 minutes, cures 2 mm per 24 hours	±25%	–60°C to +150°C	AS/NZS 4020:2018 — but not all colours are tested
Pro Trade Roof & Gutter Silicone	Skin time 5–10 minutes, cures 10 mm in 5 to 7 days	±25%	–60°C to 170°C	AS4020; also BS 5889 approved
Storm Sealant	See product page	See product page	See product page	See product page

The two products you reach for in an emergency are the two with the least published data. Selleys issues no full technical data sheet for Storm Sealant — only a VOC certificate — so it has no stated skin time, cure rate, movement capability or service temperature, and Spray Seal publishes timings but not movement or temperature. The three that publish a full set are the three that want a clean, dry substrate. That is a coherent way to use the range rather than a defect in it: stop the leak with the emergency product, then reinstate the joint properly, once the roof is dry, with one that publishes the numbers. Storm Sealant’s own page adds that full paint cover, two coats of water-based paint, is needed for durability — there the paint is part of the repair, not a finish.

Rain-ready is not cured, and the difference is days. Speed Seal sheds water in about an hour and Spray Seal in about two, but Roof & Gutter Silicone cures at 2 mm per 24 hours and Pro Trade takes five to seven days to cure 10 mm through. Those are not competing claims; they describe different moments. An hour buys a surface that will survive the next shower. The joint has neither its full strength nor its stated movement capability until it has cured through, so do not judge the repair or load a fixing on the first afternoon.

Movement capability is not what separates these products. Every one that publishes a figure gives ±25%, and all are neutral cure, so the two things that usually decide a sealant choice — how much the joint can move, and whether the cure attacks the metal — are already settled across the range. What differs is how you apply it, how wet the surface is, and how soon it has to take water.

Two smaller points. Pro Trade is the only product rated above 150°C, at 170°C. And if the gutter feeds a rainwater tank, Roof & Gutter Silicone’s potable-water approval carries a colour qualification — not every colour has been tested, and Selleys directs users to check the current test report for the colour they intend to use.

Common questions

Which product can I use on a wet roof?

Storm Sealant gives an immediate waterproof seal on any building material, wet or dry, indoors or outdoors. Roof & Gutter Spray Seal also works on wet surfaces.

What is the difference between Roof & Gutter Silicone and Speed Seal?

Speed Seal is specified as a neutral, non-acid 100% silicone with superior adhesion and resistance to lifting, aimed at repairing leaks in most forms of roofing and guttering. Roof & Gutter Silicone is described more generally as a water-tight seal that resists cracking and shrinking.

Why does non-acid matter on a roof?

Roof work is mostly metal. Speed Seal's description makes a point of being neutral and non-acid, which removes the question of the sealant acting on the metal it is sealing against as it cures.

Do I need a caulking gun?

Not for Roof & Gutter Spray Seal, which is the sprayable option and is described as easy to apply. The others are conventional sealants.

What does resistance to lifting mean?

It refers to the bead staying bonded at its edges rather than peeling away from the surface. A lifted edge stops sealing while the bead still looks in place, which is how a repaired leak comes back unnoticed.

Can I use a bathroom silicone on a gutter?

Nothing in the sources supports that. Wet area products are catalogued for bathrooms, kitchens and laundries under wet area silicone. Use a roof and gutter product for roof work.

Which one is the trade product?

Pro Trade Roof & Gutter Silicone, described for general purpose roof, gutter and weather sealing where excellent adhesion and long-term reliability are required.

Where do I find the rest of the sealant range?

Under sealants, which also covers wet area, construction, glass, fire-rated and multi-purpose products.