Disposal and Storage of Paint

Do you have leftover or expired paint sitting in your storeroom and aren't sure what to do with it? You're not alone — paint disposal is one of the most commonly mishandled household waste situations in Singapore.

Disposing of paint incorrectly isn't just an environmental concern. Under Singapore's Environmental Public Health Act (EPHA), improper disposal of hazardous waste — including oil-based paints, solvents, and thinners — can result in fines of up to S$50,000 or imprisonment. Even well-intentioned mistakes, like pouring liquid paint down a drain, can introduce contaminants into the water supply, soil, and food chain.

Here's a clear, responsible guide to disposing of and storing paint safely in Singapore.

Step 1: Identify Your Paint Type

The correct disposal method depends entirely on the type of paint you have. Before doing anything else, check the label.

• Water-based paints (latex, acrylic, emulsion) — the most common type used for interior walls, including all Nippon Paint interior wall paints. Less hazardous and can be disposed of through the regular trash once fully dried and solidified.
• Oil-based paints (alkyd, enamel) — classified as hazardous waste in Singapore. Must be disposed of through a licensed toxic industrial waste collector. Never place liquid oil-based paint in regular trash.
• Aerosol spray cans — pressurised containers that require special handling to prevent fire, explosion risk, or injury to waste collection workers.

Disposal of Water-Based Paint

Water-based paint must never be disposed of in liquid form. Do not:

• Pour paint into drains, sinks, or toilets
• Empty paint into the ground
• Put cans of liquid paint out for regular trash collection
• Attempt to burn paint

All of the above introduce contaminants into Singapore's water systems and can harm aquatic life and food sources across the region.

Before disposal, dry the paint completely:

If the can is less than a quarter full:

1. Remove the lid and place the can in a well-ventilated area, away from children, pets, and direct heat
2. Allow the paint to dry completely — this typically takes a few days
3. Once fully solid, the dried paint can go in regular household trash
4. Leave the lid off so waste collectors can confirm the paint is dry

If the can is more than a quarter full:

1. Brush or roll the paint onto layers of newspaper or cardboard spread out in a well-ventilated area
2. Allow the painted layers to dry fully, then dispose of the paper in the regular trash
3. Alternatively, pour the paint into a cardboard box and mix with shredded newspaper, cat litter, or a commercial paint hardener to speed up solidification
4. Once fully solid, the box can go in the trash — and the empty can can be recycled

Tip: Consider using up leftover water-based paint for touch-ups, a secondary project, or donate it to a community organisation or a neighbour who could make use of it. This is the most sustainable option of all.

Disposal of Oil-Based Paint

Oil-based paints — including alkyd paints, enamel paints, and varnishes — are classified as hazardous toxic industrial waste in Singapore and cannot be handled the same way as water-based paints.

You must engage an NEA-licensed toxic industrial waste collector to dispose of oil-based paint. Pouring it down a drain or placing liquid oil-based paint in regular trash is illegal and can result in significant fines.

To find a licensed collector, refer to the NEA's Directory of Licensed Toxic Industrial Waste Collectors, available at nea.gov.sg. Licensed operators will collect, transport, and treat or process the waste in a legally compliant manner.

If the oil-based paint is still usable, consider donating it to a community group or offering it to friends or family before exploring disposal.

Disposal of Aerosol Spray Cans

Aerosol containers are pressurised products. A punctured or improperly disposed aerosol can can explode, start a fire, or seriously injure waste collection workers — making correct disposal essential.

The goal is to empty and depressurise the can completely before disposal.

1. Work in a well-ventilated area, away from children, pets, and any sources of ignition (open flames, sparks)
2. Read and follow all safety precautions on the container label
3. Spray the contents into a cardboard box or onto an appropriate surface until you can no longer hear air being released from the nozzle
4. If you cannot empty the can yourself, find someone who can use the contents
5. Once the can is fully empty and depressurised, it can be placed in the regular trash or recycled

Never puncture or crush an aerosol can, even if you believe it to be empty.

How to Store Leftover Paint

If you have paint you'd like to keep for future touch-ups or projects, proper storage will significantly extend its usable life.

1. Clean the can rim — wipe away any dried or wet paint from the threads and lid of the can before sealing. This ensures a proper seal and makes it easier to open later.
2. Add a barrier layer for oil-based paints — cover the opening with a sheet of plastic wrap or wax paper before replacing the lid. This prevents a skin from forming on the paint surface and makes it easier to remove any film that develops over time.
3. Seal tightly — fit the lid securely onto the can and tap gently around the rim with a rubber mallet or hammer until it is fully sealed.
4. Store upside down — once sealed, turn the can upside down. The paint will form a natural skin against the lid, helping to seal the can and extend the paint's freshness.
5. Choose the right storage location — paint is flammable and sensitive to temperature extremes. Store in a cool, stable environment away from heat sources, direct sunlight, and open flames. In Singapore's climate, avoid storing paint in outdoor sheds or car boots where temperatures can spike significantly.

How long does stored paint last? Properly sealed water-based paint typically remains usable for up to 5 years. Oil-based paint can last up to 15 years if stored correctly. Always check the consistency and smell before use — if it's lumpy, separated beyond stirring, or has a sour odour, it's time to dispose of it responsibly.

Quick Reference: Paint Disposal in Singapore

For more information on responsible paint disposal, visit the Nippon Paint Singapore Disposal and Storage Guide or the NEA website at nea.gov.sg.