Parex USA

WeatherDry Basecoat

Cementitious base coat · US · manufacturer-sourced

Check your container: This countdown is for the Cementitious base coat variant. Similar-looking versions may have different times.

How long before Parex USA WeatherDry Basecoat can get rained on?

Short answer

Rain-safe: 1 day after application.
Fully dry: 1 day after application.
Masonry cleaners, sealers and water repellents

Masonry treatment plan

Rain-ready, dry and fully cured are different checkpoints

  1. Clean and dry the surface
  2. Apply the Cementitious base coat
  3. Keep it dry through the stated rain-free period

This product’s stated stages Quoted at 73°F

  • Working time ends10 minutes
  • Rain-ready1 day
  • Fully dry1 day

Worth noticing: Working time is only 10 minutes; the next stated stage, rain-ready, is 1 day.

Common mistake: Treating a damp wall; the moisture traps and the product will not cure properly.

Masonry cleaners, sealers and water repellents

Return-to-use gates

Open the surface gradually instead of treating cure as one moment

Touch / inspectA surface check only
Foot trafficUse the stated walking time
Heavy useWait for furniture, water or vehicle readiness

Time the masonry treatment

When did you treat the masonry?
Conditions that affect drying
Where?
Thickness

Stated times

  • Working time ends10 minutes
  • Rain-safe1 day
  • Fully dry1 day

From Parex USA data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.

Manufacturer website: parex.com

Conditions & fine print
  • Stated conditions: 73°F (23°C)
  • Times depend on temperature, humidity, film or bead thickness and airflow. Follow the current data sheet and label.
  • Region US. Formulas can differ between countries; check your container.
  • Working time ends: The sheet limits one coat to 1/8 inch.
  • Rain-safe: The source gives no conditions for this time.
  • Fully dry: At 70°F and 50% humidity.
  • Entered from the cited manufacturer documentation. Check the current label for the exact formula and region. Report outdated information
  • Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.

Confirm this is your product

Closely named formulas, colors and regional versions can use different times. Match these details to your container before starting a countdown.

Exact listing
Parex USA WeatherDry Basecoat
Variant
Cementitious base coat
Region
US
Listed use
exterior insulation system, stucco base
Timed stages recorded
tooling, rain ready, full dry
Source checked
2026-10-25

Documentation: Technical data sheet · Product data sheet v02.01, Nov 2025

Condition attached to the stated time: The sheet limits one coat to 1/8 inch.

About this product

A base coat with two time limits to respect: a 5 to 10 minute set after mixing, after which you remix, and a 24 hour dry before rain. New concrete wants 28 days and stucco 6 days.

Using this specific product

Parex USA WeatherDry Basecoat is listed here as the Cementitious base coat version for exterior insulation system and stucco base. For cleaning or sealing masonry, the useful question is not simply whether the surface looks finished—it is whether the exact next-action milestone shown above has been reached.

Before you start

  • Confirm the package says Cementitious base coat; related versions can use different timing.
  • For exterior insulation system and stucco base, pay particular attention to surface porosity, temperature, moisture in the substrate and rain forecast.
  • The sheet limits one coat to 1/8 inch. The source gives no conditions for this time. At 70°F and 50% humidity.

How to check readiness

Test a small area and watch for the stated rain-free and cure times. The sheet says the mixed material sets in 5 to 10 minutes, then to remix. Use this only as the rainfast milestone. It does not establish general cure or re-entry safety. The sheet says the base coat is fully dry in 24 hours.

Avoid this mistake

A dry-looking surface can still be taking up a sealer or repellent.

Compare with similar products

Keep going

Questions

How long before this product can get rained on?

Parex USA states: The sheet says the mixed material sets in 5 to 10 minutes, then to remix. Conditions: The sheet limits one coat to 1/8 inch.. The sheet says to protect it from rain for 24 hours. Conditions: The source gives no conditions for this time.. The sheet says the base coat is fully dry in 24 hours. Conditions: At 70°F and 50% humidity.. These are the manufacturer’s stated times, not a guarantee.

How thick can WeatherDry Basecoat go?

The sheet limits it to 1/8 inch per coat.

How long do I have to work with this product?

Parex USA states: The sheet says the mixed material sets in 5 to 10 minutes, then to remix. Conditions: The sheet limits one coat to 1/8 inch.. These are the manufacturer’s stated times, not a guarantee.

How long until this product is fully dry?

Parex USA states: The sheet says the base coat is fully dry in 24 hours. Conditions: At 70°F and 50% humidity.. These are the manufacturer’s stated times, not a guarantee.

What affects how long this product takes to dry or cure?

Times depend on temperature, humidity, film or bead thickness and airflow. Follow the current data sheet and label. Follow the product label for your conditions.

Similar products

All masonry cleaners, sealers and water repellents