Hesse HYDRO-PU Chalkboard coating HDB 54611-(colour tone)

  • Good hold on vertical surfaces
  • efficient due to its good coverage
  • Easy writing using customary chalks
  • Easy removal of chalk marks from blackboard surfaces
High opacity HYDRO-PU Effect lacquer with good coverage and good chemical and mechanical resistance. Its user-friendly flow properties make it very suitable for coating vertical surfaces. Drying leads to the formation of a sophisticated surface that is ideal for writing using blackboard chalks. This blackboard lacquer is light fast, PVC resistant and resistant to creams and perspiration. It can also be used to coat children’s toys as it is methylpyrrolidon-free and free from phthalate plasticisers.
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  • Description
  • Information on use
  • Sample process
  • Safety Data Sheets / Certificates

Fields of application

Universal use as blackboard lacquer in decorative interior design.

Technical specifications

Appearance opaque
Decopaint basis WB
Decopaint category J
Density series kg/l 1.174 - 1.195
Flow time (+/- 15 %) 100 s / DIN 53211 - 6 mm
Form of delivery fluid
Non-volatile content series % 45 - 45
VOC EU % 5.55 %
Number of coats (max) 1
Amount per layer (minimum) 120 g/m²
Amount per layer (max) 150 g/m²
Total application volume 150 g/m²
Mixing ratio (by volume) 20 : 1 HYDRO Hardener HDR 5091
Mixing ratio (gravimetric) 100 : 4 HYDRO Hardener HDR 5091

Information on use

Drying 4 h / 20 °C
Stackable after > 16 h / 20 °C
Complete drying 16 h / 20 °C
Load bearing after 7 d / 20 °C
Surface preparation Matching Hesse HYDRO basecoats, pigment fillers or coloured lacquers; dried and sanded according to instructions, clean and free from dust and grease. When directly coating cleaned or sanded foils, please apply a test coat to check the bonding!
Substrate sanding grits from-to 280 - 400
Comments on sanding The foil quality and the quality of the foil sanding are decisive factors for the quality of the final surface.
Yield per coat 8 - 10 m²/l

The spreading rate is heavily dependent on the type of application. The specifications relate to a liter of ready-for-use product, if necessary including hardener and thinner.
Working Temperature Range 18 - 22 °C
Storage temperature 10 - 30 °C
Working temperature 20 °C
conditions of transport 10 - 30 °C
Processing instructions Stir the material thoroughly before application. Clean tools with water. For removal of dried lacquer residues use Hesse HYDRO Cleaning agent HV 6917. In case of combined coatings (HYDRO- and solvent based lacquers) rinse application tools with Hesse HYDRO Reversing agent HV 6904.
General instructions on workmanship When working with HYDRO materials, parts that come into contact with the material must be made from stainless steel. The moisture content should be between 8 - 12 %. Do not apply or dry HYDRO lacquers at material or room temperatures below 18 °C. The ideal humidity for application lies between 55 and 65 %. During the lacquering process, a humidity level that is too low leads to surface defects (such as shrink cracks, etc.). Excessive humidity during the drying phase may drastically lengthen the drying time! In order to avoid adhesion problems, please sand the lacquered surfaces freshly before coating and apply lacquer to the sanded surfaces as soon as possible. When applied to foils, etc., please use a sample coating on the respective substrate to check the adhesion! The ideal complete hardening of lacquered surfaces that have been flashed off is reached at temperatures over 20 °C up to no more than 40 °C. Adequate, draft-free air exchange must be assured. The complete hardening of the lacquer will be reached after one week of proper storage (at least 20 °C room temperature). Woods containing large amounts of natural oils, such as teak, can negatively influence adhesion under certain circumstances. Water-soluble wood ingredients such those in ash and tannins in woods such as oak may cause colour changes and discolourations in the coating. We recommend that you always conduct a sample lacquering to evaluate the colour effect, adhesion and drying process under real conditions!

Blackboard in colour tone RAL 7026
MDF, laminated and sanded
1 x basecoat at 150 - 200 g /m² using Hesse 2C HYDRO Pigment filler HDP 5640-9343, mixing ratio (gravimetric) 10 : 1 with Hesse HYDRO Hardener HDR 5081 (or other Hesse HYDRO Pigment fillers)
Drying: ideally overnight at 20 °C room temperature
Sanding: 320 - 400 grit paper with subsequent dust removal
1 x finish using Hesse HYDRO-PU Chalkboard coating HDB 54611-7026, mixing ratio 20 : 1 (by volume) with Hesse HYDRO Hardener HDR 5091
Drying: ideally overnight at 20 °C room temperature.
Full surface resilience is achieved after complete hardening for 7 days at 20 °C room temperature.

Material Safety Data Sheets

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Our technical information is continually adapted to keep up to date with the latest technology and statutory regulations. The latest version is always available online at www.hesse-lignal.de or talk to your local account manager. This information is for advice and is based on the best knowledge available and careful research in line with the current state of the art. This information cannot be held as legally binding. We also refer you to our terms and conditions of business. Safety data sheet is provided in accordance with EC regulation no. 1907/2006.