Finding an answer now: expanding foam drying times can vary by brand, product density, thickness of the application, and environmental conditions like temperature and humidity. In general, you can expect:

• Tack-free time: usually within minutes to an hour or two, depending on the product. Some foams become tack-free quickly, while others may stay tacky longer as they cure.

• Full cure: most expanding foams cure to full hardness within about 8 to 24 hours. Some closed-cell foams or thicker applications might take up to 24 hours or a bit longer in high humidity or cold temperatures.

Tips for faster and safer results:

• Ensure good ventilation and temperature guidelines recommended by the manufacturer (typically around 60–80°F or 15–27°C with moderate humidity). Higher temperatures and lower humidity can speed up cure; very cold or very humid conditions can slow it.

• Do not trim, paint, or expose unseen interior portions to work equipment until the foam is fully cured to reduce fumes exposure risk and avoid compromising adhesion. A typical safe wait time is at least 24 hours for full cure before handling or finishing work.

• For open-cell vs. closed-cell formulations, open-cell foams often cure within the commonly cited 8–24 hour window, while some closed-cell foams may have similar or slightly longer cure times depending on thickness. Always check the product’s datasheet for the exact cure time.

If you’d like, specify the exact product name or type (open-cell vs closed- cell) and the thickness of the application, and the ambient conditions, and provide me with brand and product data. I can tailor the typical tack-free time and full cure window to that specific case.