SprayChalk

A temporary coating applied as an extra layer on top of another ReduSystems shading coating, giving crops extra protection during short peaks of intense heat. It washes off naturally after just a few rain showers, so no separate removal step is needed.

Suitable for glass, acrylate, polycarbonate and plastic film greenhouses, with the shading level easy to adjust to match how much extra protection is needed. As a liquid, it also disperses more evenly than powder chalk, so nozzles don't clog during application.

Extra Layer Protection

Washes Off Naturally

No Clogged Nozzles

All Greenhouse Coverings

Adjustable Shading Level

Extra Protection for Short Heat Peaks

During short periods of very intense sun, even a well-shaded greenhouse can benefit from extra protection. Because SprayChalk is applied as a top layer over an existing coating, growers can add temporary shading exactly when conditions demand it, without disturbing the coating underneath.

It mixes easily with water, and can be applied easily when extra shading is needed so growers can respond quickly when conditions change. As a liquid, it also spreads more evenly than powder chalk, so nozzles don't get blocked during use.

Diagram showing how SprayChalk adds extra shading on a greenhouse roof

Drone spraying a coating over a greenhouse roof

Flexible application

Applied by drone, machine, helicopter or by hand, so growers can use the equipment they already have.

Worker on a greenhouse roof applying a coating with a machine

All greenhouse types

Suitable for glass, acrylate, polycarbonate and plastic film greenhouses, and effective across a wide range of crops depending on climate.

Apply only under fast-drying conditions, between 5°C and 40°C, with relative humidity below 80% and wind speed under 2 m/s. Mix with clean water in the tank, stirring continuously, and apply evenly across a clean, dry surface.

Do not apply to a wet surface or in the rain, and do not combine with non-ReduSystems shading products.

Each 20kg bucket of SprayChalk is mixed with water before spraying. Growers typically use between 5 and 10 buckets per hectare (2 to 4 buckets per acre), depending on how intense the heat peak is.

The amount of water used depends on how you apply it: about 1,000 to 1,500 litres per hectare (107 to 160 US gallons per acre) by machine, or 1,700 to 2,000 litres per hectare (182 to 214 US gallons per acre) by hand. For guidance on the right dose for your specific situation, reach out to a ReduSystems specialist.

SprayChalk does not need to be actively removed. It washes off naturally after just a few rain showers, typically within 2-3 showers, depending on location and weather conditions.

ReduSol

Keeps shading the whole spectrum underneath, while SprayChalk adds extra protection during short heat peaks.

ReduHeat

Keeps light transmission high underneath, while SprayChalk adds extra heat protection during short peaks.

ReduFuse

Keeps diffusing light evenly underneath, while SprayChalk adds extra shading during short heat peaks.

ReduFuse IR

Keeps diffusing light while shading heat underneath, while SprayChalk adds extra protection during short peaks.

ReduFlex Blue

Keeps supporting photosynthesis and plant development underneath, while SprayChalk adds extra shading during short heat peaks.

Why ReduSystems

The Right Solution for Every Season

Light is the most variable factor in greenhouse growing, yet many growers do not yet use it fully throughout the year. We help growers protect, improve and adjust crop performance in every season, with a solution matched to each stage of the growing cycle.

With decades of experience in light spectra, PAR and photosynthesis, we adapt every solution to the grower's crop, greenhouse and location. Our advice is based on science and real-world results, not guesswork.

Frequently asked questions

Glass, acrylate, polycarbonate and plastic film.

It doesn't need to be actively removed. It washes off naturally after just a few rain showers, typically within 2-3 showers.

Yes. It can be applied by drone, machine, helicopter or by hand. Application methods and dilution rates can vary, so reach out to our team for specific instructions and support.

It's designed to wash off after just 2-3 rain showers, so it usually lasts through a short heat peak rather than the full season.

Yes, that's exactly what it's designed for. SprayChalk is applied as a temporary top layer over an existing ReduSystems shading coating, giving extra protection during short heat peaks. We advise against using it with non-ReduSystems shading products.

Contact us

Talk to a ReduSystems Specialist

Every greenhouse faces different light and climate challenges, depending on the season, crop and greenhouse type. Choosing the right strategy can be difficult with so many factors to consider. Our specialists offer tailored advice based on your specific situation, helping you find the right solution for your crop, greenhouse and climate, all year round. Get in touch to discuss what works best for you.

Get in touch with us

Colleagues talking at a table in a bright office

Our brands

SprayChalk

Extra Protection for Short Heat Peaks

Maximum Shading

Washes Off Naturally

Flexible Application

Works Well With Spraychalk