Does Wet Area Silicone Adhere to Wood?
Does Selleys Wet Area Silicone stick to wood?
Yes. Selleys Wet Area Silicone will adhere to wood as long as it is clean and dry. If the timber is bare, apply a coat of primer or undercoat first.
That second sentence carries more weight than it first appears to. Bare timber is porous and absorbs moisture, which means two problems for a sealant. A surface that feels dry can still hold water in the fibres, and silicone will not bond reliably to a damp substrate. And timber that takes up moisture also swells and shrinks with it, so a joint against raw timber moves more than a joint against a sealed one. Priming or undercoating gives the silicone a stable, non-absorbent face to bond to.
What Wet Area Silicone is designed for
It is a 100% neutral cure silicone for bathrooms, kitchens and laundries, delivering a waterproof and mould resistant seal that will not shrink, crack or peel away — guaranteed for 25 years when used as directed for private use and within 12 months of purchase.
Its published substrate list is broad: ceramic, glazed and porcelain fixtures, metal, copper and brass fittings, powder coated aluminium, aluminium, plastic laminates, rubber, glass, stainless steel and concrete. Being neutral cure, it does not release acetic acid as it cures, which is why it carries no restriction on which metals it can touch — unlike the acetic cure silicones, which are limited to aluminium and stainless steel.
| Technology | Neutral cure silicone, 100% silicone |
| Packaging | 300g cartridge, plus TwinPack and TriplePack in white |
| Colours | Clear, Black, Dark Grey, Light Grey, Off White, White, Ivory |
| Skin time | 5 to 10 minutes (25°C, 50% RH) |
| Tooling window | Within 5 to 10 minutes of application |
| Cure rate | Approximately 2mm per 24 hours (23°C, 50% RH) |
| Full cure | 72 hours |
| Water exposure | Shower can be used 24 hours after application |
Indicative data only, not intended for the preparation of specifications.
Preparing timber properly
- Check the timber is genuinely dry. Not surface-dry — dry. Timber in a bathroom or laundry holds moisture long after it looks ready.
- Prime or undercoat bare timber and let the coating dry fully.
- Clean the surface so it is free of dirt, grease, oil and water. Clean with turps and allow to dry completely.
- Finish the painting first. The sealant is not paintable, and painting must be completed seven days before the sealant is applied. On a timber joint this ordering is easy to get wrong — paint, wait a week, then seal.
- Cut the nozzle at a 45° angle to the joint width, fit it and load a caulking gun.
- Apply with steady pressure, pushing the sealant into the joint rather than laying it on the surface.
- Tool with a spatula dipped in detergent water within 5 to 10 minutes.
- Clean up with turps before the product skins.
- Leave it to cure — 72 hours, at about 2mm per 24 hours.
Limitations
- Not paintable. Complete painting seven days prior to applying sealant.
- Not suitable for use on PP, PE or PTFE.
- Not suitable for aquariums.
- Not suitable for food or drinking water contact.
- Not suitable for permanent water immersion.
The last point is the one to watch on a timber joint. Wet Area Silicone is made for a wet environment — showers, baths, spas, plumbing fixtures and sinks — but not for a joint that sits under standing water. A timber shower hob or bath surround is fine; a joint permanently below a water line is not.
If the timber is going to be painted
Because the silicone cannot be painted over, a visible bead against painted timber will always read as its own colour. Two ways around that: choose the closest colour from the seven available, or use a paintable product instead. Selleys 655FC is a clear hybrid sealant that is paintable with water-based paints once cured, and No More Gaps Bathroom & Kitchen is a paintable filler for damp rooms — though that product directs you back to Wet Area Silicone for gaps around baths, sinks and showers specifically.
Safety: the tooling step is where the risk actually is
Selleys Wet Area Silicone carries the signal word Warning, with two hazard statements: H319, causes serious eye irritation (Category 2A), and H317, may cause an allergic skin reaction (skin sensitisation Category 1).
H317 is the one that matters, and step 7 is where it happens. The tooling window is 5 to 10 minutes — the shortest in this part of the range — and a short window is precisely what makes people reach for a finger instead of the spatula. Skin sensitisation is not irritation: irritation settles once contact stops, but sensitisation is the immune system learning to react to the material. It is generally permanent once acquired, triggered thereafter by far smaller exposures, worsens with each contact, and is built up by repeated casual contact. Smoothing a bead with a bare wet finger, joint after joint, is that exposure pattern exactly. Use the detergent-dipped spatula, or a gloved finger. Cured silicone is inert — the hazard belongs to the material while it is wet.
H319 and the geometry of a timber joint. A bath surround, a shower hob against a timber frame or a vanity kickboard puts the nozzle at or above eye level, and a cartridge under gun pressure spits when you release the trigger. Safety glasses, and a splash gets a proper rinse rather than a blink.
Ventilate while it cures, not just while you work. This page tells you to leave the bead alone for 72 hours at about 2mm per 24 hours. A freshly sealed bathroom or laundry is a small enclosed space; leave the door open and the fan running through that period rather than shutting the room up.
The alternatives named above sit on the same rung. 655FC carries Warning with H319 and H317; No More Gaps Bathroom & Kitchen carries Warning with H317 alone, making it the lightest classification of the three where a paintable filler suits the joint.
The last answer above is a different order of product. Selleys Sealant Remover, for cured silicone, is classified Danger, Poison Schedule S5, and is over 60% petroleum naphtha: H304 may be fatal if swallowed and enters airways, H226 flammable liquid and vapour (Dangerous Goods Class 3, UN 1133, Packing Group II), H336 may cause drowsiness or dizziness, and H315. If you are redoing a timber joint, strip mechanically first and use the remover only on the residual film; ventilate the room actively, turn off anything with a pilot light or an element, keep the lid on and the tub out of reach of children, and if any is swallowed do not induce vomiting — rinse the mouth, give water, seek medical advice immediately.
Poisons Information Centre — 131 126 in Australia, 0800 764 766 in New Zealand.
Common questions
Will it stick to bare timber?
Prime or undercoat bare timber first. It adheres to wood provided the surface is clean and dry.
Why does bare timber need priming?
Raw timber absorbs moisture, and silicone does not bond reliably to a damp surface. A primer or undercoat gives a stable, sealed face to bond to.
Can I paint over the bead afterwards?
No. Painting has to be completed seven days before the sealant is applied.
What colours can I get?
Clear, Black, Dark Grey, Light Grey, Off White, White and Ivory, in 300g cartridges.
How long before it can get wet?
A shower can be used 24 hours after application, provided the bead is not disturbed. Full cure is 72 hours.
How long do I have to tool it?
5 to 10 minutes, using a spatula dipped in detergent water.
Will it corrode metal fittings next to the timber?
It is a neutral cure silicone, so it does not release acetic acid. Copper and brass fittings, powder coated aluminium, aluminium and stainless steel are all listed substrates.
Can I use it on a timber benchtop?
It is not suitable for food or drinking water contact, so keep it out of food preparation areas. Around a sink or basin it is in its intended environment.
How do I remove it if I need to redo it?
Uncured product comes off with mineral turpentine. Cured product needs cutting and scraping, or Selleys Sealant Remover.
Is there a guide to sealing a sink?
Yes — how to seal a sink.
Does Selleys Wet Area Silicone adhere to wood?
Wet area silicone sealants can adhere to wood surfaces, although wood is not explicitly highlighted as a primary application material in the standard Selleys Wet Area Silicone product specifications.
What substrates is the Selleys Wet Area Silicone product line designed to work on?
According to the technical documentation, Selleys Wet Area Silicone is suitable for materials including glass, metals (aluminium, steel, etc.), concrete, ceramic, glazed and porcelain fixtures, rubber, stainless steel, and plastic laminates.
Is there a Selleys product specifically listed as compatible with wood for silicone sealing?
Yes, PRO-TRADE All Purpose Silicone, a comparable neutral cure silicone sealant from the same manufacturer, explicitly states it is ideal for most common building substrates including glass, most metals (aluminium, steel etc.), concrete, brick, plasterboard, wood, ceramics, most plastics and most powder coated surfaces.
What surface preparation is required before applying wet area silicone to a surface like wood?
For optimal adhesion, surfaces must be clean, dry, and free of dirt, grease, oil or water. The surface should be cleaned with mineral turpentine and allowed to completely dry, and it is recommended to pretest on the substrate before full application.
Which Selleys products are recommended for silicone sealing wood in wet areas?
For wood applications in wet areas, PRO-TRADE All Purpose Silicone or PRO-TRADE Wet Area Sealant are recommended, as they are specifically formulated for moisture-prone environments and have documented compatibility with wood substrates.
Is wood listed as a featured substrate for Selleys Wet Area Silicone specifically?
No, wood is not specifically listed as a featured substrate in the Selleys Wet Area Silicone product descriptions, unlike the PRO-TRADE All Purpose Silicone which does list wood explicitly.