Hesse PU-Isolating Filler DP 4791-9343

  • very good body and perfect sanding properties
  • excellent ability to stay on vertical surfaces beneath high gloss
  • extremely wide range of applications
  • can be used as an adhesion primer for plastic
  • Decopaint compliant
DP 4791-9343 is a Decopaint compliant PU Isolation primer for the greatest isolation effect and quality demands. This product is perfectly suited for use beneath Hesse high gloss lacquers and in wet rooms. Our PU Isolation primer can be used as an adhesion primer on a wide variety of plastics due to its excellent bonding properties.
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  • Description
  • Information on use
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Fields of application

DP 4791-9343 can be used as a PU Isolation primer for shopfitting and all interior fixtures and fittings, including in kitchens and bathrooms as well as the fitting out of ship interiors.

Technical specifications

Appearance opaque
Density series kg/l 1.423
Flow time (+/- 15 %) 90 s / DIN 53211 - 4 mm
Form of delivery fluid
Non-volatile content series % 66
VOC EU % 33.970001 %
Number of coats (max) 4
Amount per layer (minimum) 140 g/m²
Amount per layer (max) 300 g/m²
Total application volume 800 g/m²
Mixing ratio (by volume) 4 : 1 PUR Hardener DR 4058
Mixing ratio (gravimetric) 100 : 18 PUR Hardener DR 4058

Information on use

Usage time 3 - 4 h / 20 °C
Pot life 2 h / 20 °C
Drying 5 h / 20 °C
Stackable after > 16 h / 20 °C
Complete drying 7 d / 20 °C
Surface preparation Clean, dry wood, depending on species and application method. Perform cleaning by sanding on foil or melamine before coating.
Substrate sanding grits from-to 150 - 320
Lacquer sanding (grit) from - to 320 - 400
Finishing After adequate drying and careful primer sanding with Hesse CN and PU coloured lacquers.
Comments on sanding Sanding with 600 grit is recommended for a high gloss top coat.
Yield per coat 5 - 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.
Storage temperature 16 - 40 °C
Working temperature 20 °C
Processing instructions The maximum application amount in wet film when used as a flame-retardant coating material for seagoing vessels totals 140 g/m².
Particular instructions When used as a flame-retardant coating for seagoing vessels, this product must only be combined with other approved and technically matching products.
For MDF substrates: With MDF coatings, you can avoid painting faults and edge breaks if you observe the following: Selection of an MDF quality suitable for the field of application, see manufacturer data on EU standard EN 622-5 pt.4 Test methods EN 317 (requirements on thickness swelling). Ideal panel moisture 5 - 7 %. If possible coat the MDF all around, the backs should at least receive a clear coating. Avoid sharp edges and milling grooves, round-off wherever possible. Coat edges and milling grooves 2 x with primer, do not sand through, if need be, prime again. Thick boards that have been built by gluing together several thinner boards are, due to the variance in tension, susceptible to edge ridging. It is better to select a single MDF board of the appropriate thickness. Panels that have been glued together should always be sanded flat at the edges and colourlessly pre-insulated. Any water introduced by the gluing process must be allowed to evaporate prior to coating. Store filler-coated surfaces in an air conditioned location and apply the final coat in a timely manner.
“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!

Bathroom furniture in MDF, suitable for deep milling, white and matt
Edge and profile sanding: 150 - 180 grit (dust removal)
Basecoat: 1 x 150 - 200 g/m², Hesse PU Isolation primer DP 4791-9343, mixing ratio (by volume) 4 : 1 with PU Hardener DR 4058,
Addition of thinner at 10 - 15 % DV 4935
Drying: at least 5 h / 20 °C, preferably 16 h / 20 °C
Filler sanding: 320 - 400 grit (dust removal)
Basecoat: 1 x 150 - 200 g/m², Hesse PU Isolation primer DP 4791-9343, mixing ratio (by volume) 4 : 1 with PU Hardener DR 4058,
Addition of thinner at 10 - 15 % DV 4935
Drying: at least 5 h / 20 °C, preferably 16 h / 20 °C
Filler sanding: 320 - 400 grit (dust removal)
Coloured lacquer coating: 1 x 120 - 150 g/m² Hesse PU Coloured lacquer DB 45245-9010, mixing ratio (by volume) 10 : 1 with DR 4070 PU Hardener, addition of 10 - 20 % DV 4994
Drying: at least 5 h / 20 °C
Lacquer sanding / smoothing: 400 grit (dust removal)
Final coating: 1 x 80 - 100 g/m², Hesse PU Multicoat lacquer DE 45032, mixing ratio (by volume) 10 : 1 with PU Hardener DR 4070, addition of 10 - 20 % DV 4994
Complete drying: at least 16 h / 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.