No-Rot Gel
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Timber Protection

No-Rot Gel

Brush-on preservative that diffuses into timber and stops fungal decay spreading. Paintable. Works on damp wood.

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1 L, 5 L and 10 L Schedule 5 — CAUTION APVMA 60197

↓ Safety Data Sheet ↓ Technical Data Sheet

Protects against: Fungi, mould and algae. At the insecticide rate, helps control borers and termites.
Use on: Above-ground timber you'll paint over
Format: Water-based gel. Brush, roller or spray.
Not for: Ground contact: use In-Ground Paste. Food-contact surfaces, drinking-water roofs.

Not sure it's the right product? Compare preservatives or call 03 9532 0679.

Directions for use

Preparing the timber, then applying — as per the approved label

Structural or load-bearing timber? Veranda posts, bearers, joists, rafters: get a qualified professional to decide whether it can be treated or needs replacing. Preservative stops decay spreading; it can't restore lost strength.

Before you open the tin

Get back to bare timberStrip or sand the painted surface back 300 mm in all directions from any visible decay, even if the rot looks localised.
Remove the decayed woodDig the decay out carefully with a chisel until you reach sound wood.
Work out how deep to treatMeasure the section, count the faces you can reach, and probe how far the decay went. That sets the dosage — see the table opposite.

Why 300 mm, and why people skip itFungal decay spreads through timber as fine tendrils, hunting for new wood, near-impossible to spot under paint. Treat only what's visible and you'll do the whole job again in two years — or replace the frame.

Applying the gel

Always read the label before use.

Wet very dry surfaces firstSpraying the surface with water before treatment enhances penetration — this is necessary at the remedial/insecticidal rate on aged timbers with very dry surfaces. Apply the gel once the water has been absorbed.
Apply the gelBy brush, roller or spraying, at the rate in the application table below for the depth required.
Second coat — at high ratesWhen using the high (remedial/insecticidal) rate, it may be necessary to apply via two coatings, 2–3 hours apart.
Seal if exposed to rainNot to be used on surfaces exposed to rain unless a suitable protective finish is applied over the No-Rot Gel to seal it into the timber.

Application rate

Recommended rate per square metre, by depth of penetration required.

Situation	0–25 mm	25–50 mm	50–100 mm
Preventative — masonry, brickwork, concrete	250 mL	500 mL	1 L
Remedial / insecticidal — timber, masonry, brickwork, concrete	500 mL	1 L	2 L

Gel rates: preventative 10 mL per 1000 cm³ · remedial/insecticidal 20 mL per 1000 cm³.

CAUTION · As per the approved label (APVMA 60197)

Safety & hazards

Signal word, restraints and first aid — from the approved label

As per the approved label. Always read the label before use.

Schedule 5 — CAUTION

Avoid contact with eyes and skin. When handling No-Rot Gel, wear protective clothing, gloves, eye protection and a vapour mask if spraying.

RestraintsNot for food-contact surfaces, potable-water roofs, ground contact, or rain-exposed surfaces unless sealed.Tap for more

Not to be used on surfaces in direct contact with foodstuffs
Not to be used on roofs collecting potable water
Not to be used on surfaces in contact with the ground
Not to be used on surfaces exposed to rain unless sealed with a protective finish

First aid

Wash contaminated skin or eyes with copious quantities of water for 15 minutes. If ingested, give water to drink. Do not induce vomiting. Seek medical assistance and contact the Poisons Information Centre (13 11 26).

Full safety directions and first aid are on the product label and the Safety Data Sheet.

Where it goes

Reachable, paintable, above ground

No-Rot Gel is for decay you can get a brush to and will paint over — above-ground timber where you can expose the affected wood. Not for timber in ground contact; that's In-Ground Paste.

Window frames & sillsThe classic rot repair — dig out the soft wood, brush the gel in, repaint.

Fascia & bargeboardsAbove-ground exterior timber that's started to go and will be painted over.

Flood-affected structural timberWorks on damp wood — treat it while it's still wet, above the groundline.

Weatherboards & claddingLocalised decay in boards you can reach from the face.

Interior structural timberBearers, joists and studs you can access — including around wet areas.

Masonry & concrete near affected timberAlso treats the surrounding surfaces that have been in contact with decayed wood.

What makes it different

Why it works

Diffuses into the timber

Water-based, so it carries the actives into the wood, following the moisture the fungus needs — not just a surface film.

Works on damp timber

Including flood-affected structural timber. Most preservatives need dry wood — but decay doesn't wait for dry wood.

Paint over it

Oil or water-based paint. Outdoors it works as an undercoat and needs a topcoat over it.

Technical data

Specifications

Active constituents

52 g/L boron (B) present as disodium octaborate tetrahydrate · 12 g/L benzalkonium chloride · solvent 878 g/L monoethylene glycol.

Protects against

Surface mould, algae and fungi; at the insecticide rate, also helps control common wood borers and termites.

Rate, coverage & reapplication

Preventative 10 mL / 1000 cm³ · remedial/insecticidal 20 mL / 1000 cm³. See the application table for per-m² rates by depth.

Pack sizes

Available in 1 L, 5 L and 10 L.

Poison schedule

Schedule 5 — CAUTION.

APVMA registration

APVMA 60197.

Storage & shelf life

Store in a cool dry place out of direct sunlight. Keep out of the reach of children. No-Rot Gel has a shelf life of 18–24 months depending on how it's stored.

Common questions

Will No-Rot Gel fix badly rotted timber?

No — and neither will any other preservative, from us or anyone else. Preservatives kill the fungus and stop decay spreading; they don't restore strength, because the wood the fungus ate is gone. Badly decayed timber has to be cut out and replaced, and if it's load-bearing that's a licensed tradesperson's call.

Will it stop termites?

No-Rot controls termite and fungal damage in the timber it treats — when active, it kills termites and rot in the treatment zone. But it's a localised treatment: it protects the timber it's applied to, not the colony or the wider structure. For an active infestation, contact a licensed pest control specialist to deal with the nest.

Can I paint over it?

Yes — oil or water-based. Outdoors it's an undercoat only and needs a topcoat, which also stops the actives leaching out.

Can I use it on wet or flood-affected timber?

Yes. It's water-based and diffuses through damp timber — flood-affected structural timber is one of its main uses. If the timber is very dry, dampen it first.

You might also need

D-Mould

Surface and sub-surface mould treatment for timber, masonry and rendered surfaces.

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No-Rot Inject

More than double the strength, in a cartridge — spread, inject or bandage into timber you can't brush.

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Australian made in Cheltenham, Victoria since 1988 — founded by two CSIRO timber scientists. The whole story →