Hesse PU isolating primer DG 4720-0001

  • isolating effect against wood contents and on resinous woods
  • isolating effect beneath Hesse HYDRO lacquers
  • very stable base coat in the complete coating with high gloss
  • particularly transparent
DG 4720-0001 is a clear base coat that is formulated for low viscosity and fast-drying. This coating material features a good isolation effect for use on resinous woods that are rich in active substances and is best suited for base coats on very dark stained woods. DG 4720-001 is also suitable for stabilising softwood (improving scratch resistance). Moreover, sinkage is further reduced with DG 4720-0001 as an isolation sealer within a complete coating using high-solid, clear base coats and high gloss lacquers.
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  • Description
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Fields of application

DG 4720-0001 can also be used for shopfitting and all interior fixtures and fittings, including in kitchens and bathrooms as well as the fitting out of ship interiors.

Technical specifications

Yield per coat 6 - 11 m²/l

The spreading rate is heavily dependent on the type of application. The specified theoretic spreading rate reduces by up to 40 % with spray applications. Brushing or manual application methods are virtually loss-free. The specifications relate to a liter of ready-for-use product, if necessary including hardener and thinner.
Appearance colourless
Density series kg/l 0.894
Flow time 34 s / DIN EN ISO 2431 - 3 mm
Form of delivery fluid
Non-volatile content series % 11.5 - 13.1
VOC EU % 88.46 %
Number of coats (max) 3
Amount per layer (minimum) 80 g/m²
Amount per layer (max) 150 g/m²
Total application volume 400 g/m²
Mixing ratio (by volume) 2 : 1 PUR Hardener DR 4040
Mixing ratio (gravimetric) 100 : 58 PUR Hardener DR 4040

Information on use

Usage time 30 - 60 min / 20 °C
Pot life 1 h / 20 °C
Drying 2 h / 20 °C
Stackable after > 16 h / 20 °C
Complete drying 7 d / 20 °C
Surface preparation Clean, dry wood, dependent upon wood type and method of application.
Substrate sanding grits from-to 150 - 180
Intermediate lacquer sanding (grits) from-to 320 - 400
Finishing After sufficient drying and intermediate sanding  with almost all Hesse PU lacquers.
Working temperature 20 °C
Processing instructions The process sequence and the number of coats required for insulation should be determined by applying a test coat to the original wood. Washing the wood beforehand with Hesse Wood soap BZ 850 or Hesse Thinner DV 4900 can reduce the amount of work involved. Please note that there may be changes to the colour and expressiveness of the wood as a result. A drying time of 16 h / 20 °C must be adhered to when working with content rich wood species! DG 4720-0001 can additionally be used on content rich, resinous woods or even on exotic wood species as an isolation sealer for transparent and coloured HYDRO lacquers. It should be noted that DG 4720-0001 must not be sanded back to the bare wood after drying and the required lacquer sanding. Please also observe the technical information for the respective HYDRO product. Conduct a trial coating on the original wood as necessary.
Particular instructions This product is not suitable for application on bleached surfaces and for coating wengé wood. For use as MDF edge insulation under coloured lacquer systems, prepare the lacquer/hardener mixture with 20 - 30 % DV 494 or DV 4994 thinner. Always apply another coat on the same day, after prior sanding with grit 320 - 400 grit. When used as a flame retardant coating material for seagoing vessels according to SOLAS 74/88 Regulations II-2/3, II-2/5 and II-2/6, in the latest version, IMO Resolution MSC.36(63)-(1994 HSC-Code) 7 and IMO Resolution MSC.97(73)-(2000 HSC-Code) 7, this product may only be combined with other approved and technically suitable products. When used as a flame retardant coating material for seagoing vessels, the maximum total application amount in wet film is 200 g/m².
“A risk assessment was undertaken according to Directive 2014/90/EU, Annex II, Section 3. This coating does not pose a physical risk to health nor a risk to the environment when cured and dried.”
General instructions on workmanship PU lacquers should not be applied and dried at material and room-temperatures below 18 °C and 40 % RH. Ideal values are: 20 - 25 °C, 50 - 65 % RH. Deviations will result in drying or hardening errors. In order to avoid adhesion problems, please sand the PU lacquered surfaces before applying fresh lacquer and apply lacquer to the sanded surfaces as soon as possible. Old lacquer and hardener mixtures affect the surface quality (adhesion/resistance). Freshly bleached substrates must undergo intermediate drying for at least 48 h at 20 °C before coating with suitable PU lacquers. If stored correctly (at least 20 °C room temperature), the final hardness of the coating is achieved after a week.
Please apply a test coat under real conditions!

Ship interior, stained mahogany, high-gloss
Raw-wood sanding: 150 - 180 grit (dust removal)
Stain with wiping: BE 15-20400
Drying: 2 - 3 h / 20 °C.
Priming: 2 x 100 - 120 g/m² (intermediate drying in each case 20 - 30 min / 20 °C) Hesse PU insulating primer DG 4720-0001, mixing ratio (by volume) 2 : 1 with DR 4040 hardener and addition of 10 % thinner DV 4994
Drying: at least 2 h / 20 °C
Lacquer sanding: 320 - 400 grit (dust removal)
Priming: 1 x 140 - 200 g/m², Hesse PU OPTI-BASE DG 4763, mixing ratio (by volume) 1 : 10 with Hardener DR 4037 and addition of thinner as required with DV 4935
Drying: 16 h / 20 °C
Intermediate sanding: 320 - 400 grit (dust removal)
Priming: 2 x 140 g/m² (intermediate drying in each case 45 - 60 min / 20 °C) Hesse PU OPTI-BASE DG 4763, mixing ratio (by volume) 1 : 10 with hardener DR 4037, addition of thinner as required with DV 4935
Drying: at least 16 h / 20 °C
The more porous the wood, the more basecoats must be applied. The completed basecoat should already look completely flat before the final sanding! Drying of the last basecoat for at least 24 h / 20 °C
Lacquer sanding, progressively finer: 400 - 600 grit (dust removal)
Top coat: 2 x 100 - 120 g/m² (intermediate drying in each case 20 - 30 min / 20 °C) Hesse PU Brilliant lacquer DU 45229, DR 4037 (by volume) 2 : 1 with Hardener DR 4005, addition of a 10 - 20 % thinner DV 4935
High-gloss polishing possible: after drying for at least 24 h / 20 °C
Packable: after 3 d / 20 °C


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.