• Temporary coatings

      Shading coatings that wear off gradually over time and do not need to be cleaned off at the end of the season. This range is designed to offer growers an effective, user-friendly solution.

      Temporary protection from light and heat for different periods of time without having to clean the paint off at the end of the season.

    • Removable coatings

      Often called On/Off, these coatings produce results that are stable over time until removed using the appropriate cleaning product.

      Removable protection against heat and light

      Removable protection from heat while maintaining grow-light

      Cleaning agent for removing shading agents


      Not entirely sure which solution fits your needs best? We’ve collected some resources to help you out.

      Online Product Advice

      Get instant product advice in 5 easy steps.

      Understanding light

      How do our coatings influence the sunlight?

      Frequently Asked Questions

      Quick answers to frequently asked questions.

      How to apply Sudlac coatings

      Instructions for application of our coatings on your greenhouse

  • Contact

Manual application of a coating is a specialized precision job

If a greenhouse is not coated by machine, then somebody has to get up on the roof of the greenhouse with a spray gun. Spraying company Hastra is specialized in this task.

If a greenhouse is not coated by machine, then somebody has to get up on the roof of the greenhouse with a spray gun. Spraying company Hastra is specialized in this task.

“We always take safety into consideration in our work. The gutter has to be wide enough to walk in and the roof must be suitable for our cart, which serves as a support”, emphasizes Remco Haslinghuis.
Together with Ricardo Torenstra he started Spraying company Hastra three years ago. Before this, he had almost 25 years of experience at another contracting firm.
Hastra specializes in manual application of coatings on the greenhouse cover and, in addition, cleaning the inside when crops are switched. “The number of greenhouses that require manual chalking is steadily decreasing. The same applies to the number of people who can perform this task. It is becoming a scarce profession, so we have plenty of jobs”, explains Haslinghuis.

Widespan greenhouses

There are many greenhouses, particularly for ornamental crops, that are not suitable for coating by machine. These are the so-called widespan greenhouses or interlinked greenhouses with complicated angles. There are also other reasons why a machine cannot be placed on the roof, for example the location or the greenhouse equipment.
The art of manual chalking is to apply the layer as evenly as possible to the roof. You have to walk at a gentle, even pace and move the spray gun up and down. Constant pressure and correct maintenance of the equipment are essential to ensuring the best result. “We mix the desired coating in the cubic meter container – we often use Eclipse LD, which reduces both light and heat. We bring 400 meters of tubing with us, connected to the pump. That length is always enough”, he explains.

He occasionally also applies a different coating, but in general the customers require relatively heavy shading. “We are talking about 18 to 22 buckets per hectare. We have a lot of clients with shade-loving pot plants”, he explains. His customer base also includes other ornamental plant companies.

Energy crisis

The demand has clearly changed as a result of the energy crisis. The work has not necessarily dried up, but it takes place at different times.
“As growers are forced to cut the costs of lighting, they are now more dependent on natural sunlight. As a result, they want the coating applied later in the season and removed again sooner. Whilst of course taking into consideration what the specific crop can handle”, he concludes.