# Why are there brown drips on my new paint?

Canonical: https://colorswatchlab.com/guides/surfactant-leaching/
Author: Color Swatch Lab Editorial Team
Published: 2026-11-03
Updated: 2026-11-03
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> Tan, brown or clear streaks and drips that feel soapy, glossy or sticky on paint applied in the last few days or weeks are almost always surfactant leaching. Surfactants are soap-like ingredients in every latex paint. When fresh paint gets damp before it has cured, from shower steam, cool humid air, dew or rain, water pulls them to the surface. When the water dries it leaves a residue behind. It looks bad but is cosmetic and does not harm the paint. Wash it off with soap and water, or rinse exterior surfaces with a hose, as soon as you see it. It may come back once or twice before it stops. Do not paint over it. Prevent it by painting when it is warm and dry and by keeping a freshly painted bathroom dry and ventilated until the paint has cured.

## What surfactant leaching looks like

Sherwin-Williams describes surfactant leaching as water-soluble paint ingredients called surfactants collecting on the surface of latex paint. It may show as tan, brown or clear spots or areas, and they can be glossy, soapy, oily or sticky. Its homeowner guide says the residue often collects to look like water droplets and has no odor. Benjamin Moore describes the same thing as brown residue or streaks on interior and exterior paint. It notes that on exterior paint the residue can look like an oily or sticky, sap-like substance, sometimes called weeping. The typical places are a bathroom ceiling a few days after the first hot shower, or siding, soffits and porch ceilings painted late on a cool afternoon.

| | Surfactant leaching | Mildew | Smoke or nicotine stain |
| --- | --- | --- | --- |
| Looks like | Tan, brown or clear droplets, runs or patches, often glossy | Fuzzy or slimy spots; up close, circular spores | An even yellow-brown film, with outlines where pictures and lamps were |
| Feels or smells | Soapy, oily or sticky; no odor | Musty odor | Smells of smoke; not sticky like leaching |
| When it shows up | While fresh latex is still drying or curing, after moisture reaches it | Any time in damp areas | Builds up over months or years |
| What to do | Wash or rinse off; do not paint over | Fix the moisture, clean, then paint | Clean, seal with a stain-blocking primer, repaint |

The comparison follows Sherwin-Williams’ guide, which separates surfactant leaching from mold and from nicotine damage. Mold is a moisture problem in the room or the wall, covered in [bathroom paint and mildew](https://colorswatchlab.com/guides/bathroom-paint-and-mildew/). Smoke stains, and yellowing paint in general, are in [why white paint turns yellow](https://colorswatchlab.com/guides/why-is-white-paint-turning-yellow/).

## Why it happens

Surfactants are not a defect. Sherwin-Williams says latex paints contain them to make the paint possible to apply, and that all latex paints can show some leaching if moisture reaches uncured paint. Benjamin Moore explains that these water-soluble ingredients normally migrate to the surface slowly over time. High moisture or humidity while the paint is drying or curing brings them up too early, and they leave a residue. Three conditions show up in all three manufacturers’ explanations:

- **Moisture on fresh paint.** Sherwin-Williams calls moisture the number one cause. Water on a fresh latex film slows its drying, pulls water-soluble materials out of the paint and concentrates them on the surface. When the water evaporates, it leaves stains, runs and patches of uneven gloss. Bathrooms, laundry rooms and kitchens are the most susceptible rooms. Outside, eaves, soffits, balconies and covered patios collect the moisture.

- **Cool temperatures.** Cold slows curing, so surfactants have time to separate and float to the top. Behr points to painting in cool, humid conditions or just before or after rain. Benjamin Moore points to early fall, when frost can form overnight.

- **Deep colors.** Benjamin Moore and Sherwin-Williams both note that deeper tints are more prone, because the colorants add extra surfactants. Dark colors do not cause leaching, but they leach more readily when conditions are wrong.

## How to remove it

**Inside.** Sherwin-Williams says to wash the area with soap and water and rinse. The discoloration may come back several times before all the surfactant is gone, so repeat as needed. Benjamin Moore says to rinse with water or wipe with a damp cloth as soon as you notice it. Use a soft sponge or cloth and do not scrub hard on new paint. [How to wash painted walls](https://colorswatchlab.com/guides/how-to-wash-painted-walls/) has the gentle technique, and [dry time versus cure time](https://colorswatchlab.com/guides/paint-dry-time-vs-cure-time/) explains why fresh paint is still soft.

**Outside.** Act quickly. Sherwin-Williams says to flush the stains with clean water right away, before they have time to set and harden. Light scrubbing with a soft brush is acceptable. Behr says that if leaching appears in the first few days, a strong stream of water from a garden hose usually rinses it off, and that a month of normal weathering removes even stubborn cases. Benjamin Moore and Sherwin-Williams both say ordinary weathering usually removes minor exterior leaching on its own. If the stains will not come off, Sherwin-Williams says to repaint in better weather.

## Do not paint over it

All three manufacturers say this. Sherwin-Williams explains that painting over the residue traps it and makes it worse over time, and that the new paint will not adhere properly, which can lead to bubbling and blistering. Behr says never to apply another coat over a painted surface that shows surfactant leaching. If you are repainting a bathroom that has old leaching stains, Benjamin Moore’s data sheet for its bath paint says to wash the surface thoroughly, let it dry, and prime areas with heavy leaching before the topcoat. The same sheet lists a 24-hour minimum before returning the room to full service and two weeks before the paint can be washed, and warns that high humidity and cool temperatures stretch those times.

## How to prevent it

- **Keep a freshly painted bathroom dry.** Sherwin-Williams says paint in a bathroom should dry thoroughly before anyone uses the bath or shower. It suggests waiting a few days before using the room and ventilating between showers. Run the exhaust fan and check the humidity with a hygrometer. Fan sizing and the moisture side of bathrooms are in [bathroom paint and mildew](https://colorswatchlab.com/guides/bathroom-paint-and-mildew/).

- **Paint outside early in the day, in warm, dry weather.** Behr says to avoid painting when temperatures will be below 50°F in the late afternoon and when cool, damp conditions are expected in the evening or overnight. The dew point and temperature rules are in [exterior painting weather](https://colorswatchlab.com/guides/exterior-painting-weather/).

- **Follow the label.** Sherwin-Williams’ prevention list starts with following the manufacturer’s preparation and application instructions, including storing paint at the right temperature.

- **Use a paint made for humid rooms.** Both Sherwin-Williams and Benjamin Moore suggest paints formulated for high-humidity rooms in bathrooms. Even those need clean, dry walls: residue left on the old surface can still come through.

Leaching is a cosmetic problem. Benjamin Moore and Behr both say it does not affect the paint’s durability. If the paint is lifting in bubbles rather than streaking, the problem is different: see [why paint bubbles](https://colorswatchlab.com/guides/why-is-paint-bubbling/).


## FAQ

### What are the brown drips on my freshly painted bathroom ceiling?

Almost always surfactant leaching. Steam reached the latex paint before it cured and drew soap-like ingredients to the surface. Wash them off with soap and water and rinse. They may return once or twice before stopping.

### Is surfactant leaching harmful?

No. Benjamin Moore and Sherwin-Williams describe it as cosmetic. It does not harm the paint, the wall or the people in the house, and Behr says it does not affect the coating’s durability.

### Can I paint over surfactant leaching?

No. Sherwin-Williams says painting over it traps the residue and makes it worse, and the new paint will not adhere properly. Wash it off, let the wall dry, and prime heavily stained areas before repainting.

### How do I get surfactant leaching off exterior paint?

Rinse it with clean water as soon as you notice it, with light scrubbing using a soft brush if needed. Behr says a strong stream from a garden hose usually works in the first few days, and a month of weathering removes even stubborn cases.

### How long should I wait to shower after painting a bathroom?

Long enough for the paint to dry thoroughly. Sherwin-Williams suggests waiting a few days and ventilating between showers. One Benjamin Moore bath paint sheet lists at least 24 hours before full service, longer in humid or cool conditions. Your can’s label decides.

## Sources

- [Surfactant leaching: problem solver for pros (Sherwin-Williams)](https://www.sherwin-williams.com/painting-contractors/problem-solver/resources/sw-article-pro-surfactant)
- [How to fix surfactant leaching (Sherwin-Williams Project Center)](https://www.sherwin-williams.com/en-us/project-center/maintenance-repair/surfactant-leaching)
- [Surfactant leaching: troubleshooting (Benjamin Moore)](https://www.benjaminmoore.com/en-us/contractors/job-solutions/troubleshooting/surfactant-leaching)
- [Surfactant Leaching - Paint Problem Solver (Behr Pro)](https://www.behr.com/pro/resources/paint-problem-solver/paint-problem-solver-detail/surfactant-leaching)
- [Aura Bath & Spa (532) technical data sheet (Benjamin Moore, PDF)](https://media.benjaminmoore.com/WebServices/prod/assets/production/datasheets/TDS_0532/532_TDS_US.pdf)