A typical scenario (an illustrative situation based on common post-flood problems, not a review from any specific customer)

Grandpa's teak cabinet survived the flood, but the thinner smell sent his granddaughter to stay with her aunt

Somchai, a 67-year-old retired civil servant, has lived for almost forty years in a half-timber house down a soi off Lat Phrao Road. The house holds a teak display cabinet, a hardwood dining table and folding timber doors that his father commissioned as a young man. In late September 2026 heavy rain fell for days, water flowed in from the soi, and it sat around the legs of the cabinet and table for several days. When it receded, the wood at the base carried dark water stains, the old lacquer had turned cloudy white, some spots had swollen and peeled, and white mould was appearing in the drawer joints.

Somchai refused to throw away the family's memories, so his son hired a local carpenter to restore the pieces at home. The carpenter sanded off the old finish, used stripper in places, applied wood stain and sprayed several coats of lacquer in the ground-floor hall, because the set was too heavy to move. After three days the furniture gleamed like new.

But a sharp smell of thinner and lacquer filled the house. Days after the carpenter left, it was still soaked into the curtains, pillows and upstairs mattresses. His ten-year-old granddaughter, who has asthma, started coughing at night. Somchai had headaches and felt woozy every afternoon. In the end his son took the girl to stay with her aunt. How long will the smell last, is it dangerous, and is there a way to save the wooden furniture without the family breathing chemicals for weeks?

This article explains where thinner and lacquer odour comes from, the health and fire risks, why repairing flood-damaged furniture inside the home leaves the smell lingering, how to plan safer repairs, and where the ozone odour and chemical-residue removal service from World Health Disinfection (WHD) fits in.

The 2026 Bangkok floods and a wave of furniture repairs

According to news reports, around 300 mm of rain fell on Bangkok in roughly 48 hours between 24 and 27 September 2026, and on 26 September all 50 districts were declared a disaster zone. Eastern Bangkok was hit hardest, with Khlong Chan and Bueng Kum mentioned. Governor Chadchart said the canals were full and drainage would take two to three days after the rain stopped. As of 30 September, reports said roads such as Lat Phrao and Si Burapha still had 20 to 40 cm of water. Thai media compared the event with the 2011 floods, and a Thai business report cited a Chamber of Commerce estimate of about 12,300 million baht in damage.

Wooden furniture is among the most damaged property in a flooded home: cabinets, tables, beds, doors, stairs and timber floors. Many households choose repair over replacement because hardwood is expensive and some pieces carry deep sentimental value. Sanding, staining and lacquering are now happening all over the city at once, bringing a problem few people expected: thinner and lacquer smells that linger for days or weeks.

Understanding thinner, lacquer and wood finishes

What thinner is

Thinner is a blend of organic solvents used to thin lacquer or paint for spraying or brushing, and to clean tools. Its solvents evaporate very quickly, which makes work dry fast but also fills the room with concentrated vapour during the job. Common thinner solvents such as toluene, xylene and ketones are volatile organic compounds (VOCs) with a distinctive sharp smell.

Lacquer and other finishes

The lacquer most local carpenters use is nitrocellulose, which dries quickly to a gloss but must be mixed with thinner and sprayed in several coats. There are also polyurethanes, wood stains, shellac and finishing oils, each with different solvents and curing times. Post-flood furniture repair often chains several products, from stripper and stain to sanding sealer and top lacquer, so the smell at home is a blend of many substances.

Why the smell stays after the surface feels dry

A lacquer surface may be touch-dry quickly, but solvents trapped in thick coats and in the wood keep escaping slowly. Meanwhile, curtains, cushions, rugs, pillows and mattresses absorb vapour while the carpenter works and release it again as the air warms. That is why the house still smells of thinner days after the work is done.

Wood that is still wet from the flood complicates things

Timber that soaked for days holds moisture deep inside. Sand and lacquer it before it is truly dry and the finish often turns cloudy, bubbles or peels later, while moisture trapped under the coating feeds mould. The house ends up smelling of both thinner and damp wood.

More than a smell: health and fire risks

Health effects of solvent vapour

Short-term exposure to thinner and lacquer vapour commonly causes headaches, dizziness, light-headedness, nausea, stinging eyes and nose, throat irritation and coughing. In closed spaces with heavy vapour, people may feel drowsy or almost drunk. That is why anyone working with solvents should use a suitable respirator and good ventilation.

People who need extra care

• Children and people with asthma, whose airways react easily to irritants.
• Older adults with heart or lung conditions or on several medications, who risk falls when dizzy.
• Pregnant women, who should avoid areas where solvents are used and consult a doctor about concerns.
• People with chemical sensitivities or allergies.
• Pets, especially birds and cats.

Thinner vapour ignites easily

Thinner and lacquer vapours are highly flammable. In a closed room where vapour builds up, a spark from a switch, plug, fan motor, gas stove or cigarette can start a fire. In a flooded house where some wiring may not yet have been checked, the risk is higher. Have an electrician inspect the system before use, never smoke or use naked flames near the work, and keep solvent containers tightly closed and outside the house.

Rags soaked in some oil-based wood finishes can heat up and ignite on their own if bunched in a bin. Handle them as the product label directs, for example by laying them flat to dry outdoors or keeping them in a closed metal container of water before disposal.

If anyone has difficulty breathing, chest tightness, severe dizziness or symptoms that do not improve in fresh air, see a doctor. Fever, calf pain or diarrhoea after wading through floodwater may signal leptospirosis or another infection and also need a doctor. Removing odour at home is not medical treatment.

What days of thinner smell cost a household

Health: daily headaches and dizziness, poor sleep because pillows and mattresses smell of solvent, and asthma flare-ups in children make an exhausting recovery even harder.

Money: curtains, pillows and bedding sent for washing, temporary accommodation for vulnerable relatives, several air purifiers, all on top of the repair bill.

Time: rooms with finished furniture remain unusable, bedrooms above the work area smell too, and nobody knows how long to wait.

Business: restaurants, cafés, shops and homestays that refinished counters, tables or floors cannot open while a solvent smell competes with food and drink.

Family: seeing a cherished piece restored should be a joy, but when it forces a grandchild to move out, that joy turns into worry and guilt.

Why common ways to chase away thinner smell fall short

1. Perfume sprays and scented candles

Perfume adds another volatile to the air, and a candle or incense stick is a naked flame in a room that may still hold solvent vapour. Do not do this.

2. Charcoal, coffee grounds or onions

They may absorb a little odour inside a drawer, but cannot keep up with vapour from large furniture and fabrics throughout the house.

3. Shutting the room and running the AC

The air-conditioner recirculates the same air, so vapour keeps circulating and soaks further into curtains and bedding, while build-up in a closed room adds to the fire risk.

4. Wiping the furniture with more thinner

Some people assume residue on the surface causes the smell and wipe it again with thinner, adding more solvent and possibly damaging a finish that has not finished curing.

5. Re-coating wood that is still damp

More lacquer on wet wood means redoing the job, using more thinner and lacquer, while mustiness from mould under the coating remains.

Planning safer repairs for flood-damaged wooden furniture

1. Sort before you repair. Solid hardwood is often worth saving; swollen, crumbling particleboard or MDF usually is not and can harbour mould and odour.
2. Clean and disinfect. Wash off mud with clean water and detergent, wipe away mould, then disinfect cleaned surfaces with a labelled product such as Chemgene HLD4H medical-grade disinfectant at the stated dilution and contact time.
3. Dry slowly in the shade. Remove drawers and doors so air flows through. Avoid strong sun, which can warp or crack timber. Have the carpenter check moisture before sanding and finishing.
4. Spray outside the house where possible. Take removable pieces to the workshop or an outdoor area. For pieces that cannot move, close off the room, open windows, run extractor fans and send vulnerable family members elsewhere during the work.
5. Choose products wisely. Ask about water-based finishes or products the manufacturer describes as low-VOC where suitable, and follow label recoat times.
6. Clear all solvents out of the house. Seal tins of thinner, lacquer and stripper and take them outside along with used rags.
7. Ozone once the finish has dried as the manufacturer recommends, to deal with remaining thinner and lacquer odour in the air, fabrics and materials, plus mustiness from wood that was soaked.

Questions to ask your carpenter before work starts

• Which pieces can be taken to the workshop, and which must be finished on site?
• What stripper, stain, sealer and lacquer will be used, and is a water-based or lower-VOC option suitable for this wood?
• How will you check that the wood is dry enough before sanding and finishing?
• How long should each coat dry before the next, and how long until the finish is fully dry according to the manufacturer?
• Where will thinner tins and used rags be stored each evening, and will they all be taken away when the job is done?
• Which rooms should be sealed off, and when can children and older relatives safely return to the work area?

Clear answers to these questions make the job safer, reduce the amount of solvent released inside your home, and make it easy to schedule ozone treatment at the right moment rather than guessing.

The WHD ozone service for thinner, lacquer and chemical-residue odour

According to World Health Disinfection's service information, the service uses ozone (O3) to break odour molecules apart at the source rather than mask them, covering paint, thinner, epoxy and lacquer odours, VOCs and musty smells, as well as bacteria, viruses and mould. Once the reaction is complete, ozone reverts to oxygen and leaves no residue.

For a home that has just had furniture refinished, the advantage is that ozone is a gas that reaches curtains, pillows, mattresses, cushions and drawer cavities that absorbed vapour, and it tackles mustiness from flood-soaked wood at the same time.

How the work is done

1. Questions about the repair: finish type, number of coats, completion date and where the work was done, to confirm the finish has dried per the manufacturer.
2. Site readiness check. All thinner, lacquer and stripper containers and solvent-soaked rags must be removed from the house first, because ozone is an oxidiser and should not be used where open solvent containers remain.
3. TVOC measured before treatment with calibrated instruments, according to the service information.
4. Empty, closed space. People, pets and plants leave; doors and windows are closed; drawers and cabinet doors opened as advised.
5. Treatment with a Master Ozone Generator at the concentration and duration set for each zone.
6. Rest and ventilation while ozone reverts to oxygen. According to the service information, the space is ready about two hours after treatment.
7. TVOC measured again so the owner can compare before and after.

Safety: ozone treatment is done only in an empty, closed space. People, pets and plants stay out throughout and return only after the rest and ventilation period. Never treat while lacquer is still being sprayed or the finish is still wet.

More details on the ozone thinner-odour and chemical-residue removal service page.

10 reasons to finish a furniture repair with ozone

1. It breaks down thinner and lacquer odour at the source, rather than covering it with perfume.
2. It is built for chemical odours. According to the service information, it covers paint, thinner, epoxy, lacquer and VOCs. Read more on the chemical-odour ozone service page.
3. It reaches curtains, pillows and mattresses that absorbed vapour during the work.
4. Drawer cavities and the backs of cabinets are covered, places a cloth or fan cannot reach.
5. It tackles mustiness from flood-soaked wood at the same time, since ozone works on musty odours and mould.
6. No additional chemical residue. Ozone reverts to oxygen, suiting homes with children and older relatives.
7. Before and after TVOC figures help you decide when vulnerable family members can come home.
8. A fast return, about two hours after treatment according to the service information.
9. It suits shops and restaurants that refinished counters or tables and need to reopen fast. See the WHD ozone service.
10. It protects both memories and health, keeping treasured furniture without trading away the air your family breathes.

Example case: a small wooden café in Bueng Kum that delayed opening because of lacquer smell

This example case is a hypothetical scenario built from common problems to illustrate the process. It is not a real customer review.

Mint runs a wood-themed café in a Bueng Kum shophouse. The bar counter, tables and shelves are all solid wood. Floodwater reached the table legs and counter base in late September. Afterwards the finish turned cloudy, some pieces swelled, and a musty smell appeared.

Mint had a carpenter sand and re-lacquer everything within three days to reopen quickly. But on the test-brewing day the thinner smell overpowered the coffee, staff complained of headaches, and she postponed opening.

A closer look showed part of the counter base was damp plywood and the lacquer had gone on too soon. The damp, mouldy plywood was replaced, surfaces were washed and disinfected according to the label, and the wood dried with a dehumidifier. Tables went to the carpenter's workshop for refinishing; the fixed counter was done with windows open and extractor fans running. Once the finish had dried as the manufacturer recommended, all thinner, lacquer and rags were removed, coffee beans, milk and ingredients taken out, and ozone booked with nobody inside.

TVOC was measured before, the café treated zone by zone, rested and ventilated, then measured again. In this example the reading after treatment was lower than before, and coffee became the café's main aroma again. Mint's lesson: letting wood dry first and moving spraying outside where possible reduced the odour from the start, and ozone finished off the rest.

Checklist: repairing flood-damaged wooden furniture and reducing thinner smell

Before repair

• Separate solid wood worth saving from swollen particleboard or MDF.
• Wash off mud, wipe away mould and disinfect according to the label.
• Dry wood slowly in the shade and have its moisture checked.
• Have an electrician check the wiring before using power tools indoors.

During repair

• Move spraying outside the house whenever possible.
• Open windows, run extractor fans, and allow no flames or smoking.
• Keep children, asthmatics, older relatives, pregnant women and pets elsewhere.
• Remove or cover curtains, pillows and bedding in the work area.
• Handle solvent- or oil-soaked rags as the label directs.

Before and after ozone

• Wait until the finish has dried for the manufacturer's stated time.
• Take all thinner, lacquer, stripper and rags out of the house.
• Make sure people, pets and plants are out during treatment.
• Return only after the rest and ventilation period the team specifies.
• Keep ventilating for the first days and watch the wood for mould.

Frequently asked questions

1. The carpenter just finished spraying. Can we ozone now?

No. Wait until the finish has dried for the time the manufacturer specifies, and remove all solvent containers and rags first. The team will ask about the job to set the right date.

2. Will ozone damage lacquer or wood?

The team sets concentration and duration to suit the space. If you have antiques or materials you are particularly concerned about, tell the team in advance so you can plan together.

3. Can we stay upstairs during treatment?

No. Ozone treatment takes place in an empty, closed space. People, pets and plants stay out until the rest and ventilation period is over.

4. Do curtains and mattresses that smell of thinner need washing?

Wash what is washable as usual. For mattresses, sofas and large curtains that are hard to wash, ozone treatment of the whole room helps with odour absorbed in the fabric.

5. How will I know the smell has really dropped?

According to the service information, WHD measures TVOC with calibrated instruments before and after, giving you figures to compare.

6. Can carpentry workshops or furniture factories use the service?

Yes. WHD serves homes, condos, offices, factories, construction sites, hotels and storage spaces.

7. Does ozone protect the furniture from the next flood?

No. Ozone does not prevent flooding or water damage. It reduces odour, VOCs and residual germs during recovery. For future heavy rain, follow BMA announcements and consider raising valuable furniture or moving it upstairs in advance.

Furniture repaired, but the house still smells of thinner and lacquer?

Let the WHD team measure TVOC and plan a safe ozone treatment, so your family can live comfortably with the furniture they love.

See the Ozone Chemical-Odour Service

Call 065-556-6294  |  LINE @whd268  |  worldhealthdisinfection@gmail.com

Related pages

• Ozone odour and chemical-residue removal service
• Residential and building ozone disinfection
• Chemgene HLD4H medical-grade disinfectant

References

• Wikipedia: 2026 Bangkok floods
• Al Jazeera: Disaster zone declared across Bangkok
• CDC: Floods
• WHO fact sheets