DINITROL 4941/ CAR underbody protective coating 1 L

Description

DINITROL 4941 / CAR is a solvent-based bitumen protective coating for both complete and local underbody treatment. Once dry, it forms a firm black protective film with high wear resistance and good flexibility.

It is used in vehicle production, pre-delivery preparation and subsequent anti-corrosion treatment in workshops. It is also suitable for protecting spare parts, machinery and steel structures exposed to highly corrosive environments.

Withstands water and road dirt The firm protective film is designed for underbody parts exposed to water, grit and mechanical stress.

Resistance in salty environments At a dry film thickness of 500 μm the protection lasts more than 2000 hours in the ISO 9227 salt spray test.

Compatible with underbody materials Adheres to metal and painted surfaces as well as existing PVC coatings, and does not harm zinc, rubber or plastic parts.

Temperature stability The coat keeps its adhesion at low temperatures and withstands temperatures up to +130 °C.

Black bitumen film as the final underbody protection

The defining features of 4941 / CAR are its bitumen base and black final finish. Once dry, it forms a firm protective coat with good adhesion and wear resistance.

This makes the material especially suitable where robust black protection is required for the underside of the vehicle and for components exposed to harsh environments.

Typical uses in the workshop and for underbody protection

• full-surface protection of the vehicle underbody
• local restoration of a damaged protective coat
• painted and unpainted metal surfaces
• PVC and similar underbody coatings
• spare parts, machinery and steel structures

It can also be used to protect parts during storage or transport in environments with an increased risk of corrosion.

Surface preparation and application

For direct application, the substrate must be clean, dry and free of corrosion. If corrosion is already present, first treat the surface with a penetrating product such as DINITROL ML or a suitable cavity wax.

Key Features

• Clean and dry the surface thoroughly
• Stir the material thoroughly before application
• For the 1 L pack, a UBS application gun for underbody materials is suitable
• For larger applications, manual or automatic equipment, Airless or Airmix can be used
• The recommended material and application temperature is 15–30 °C
• The recommended wet film thickness is 500–800 μm

What you will need for the job

Use a UBS gun to apply from the 1 litre can, and the DINITROL UBS/HR gun for series work and an adjustable spray pattern. Extension nozzles help you reach closed sections and hard-to-access areas.

Check the applied coat with a coating thickness gauge — the life of the protection depends directly on it.

Cover the surrounding parts with material from the masking category and work with gloves and eye protection.

Have white spirit and wipes ready to wipe off overspray.

Coat thickness and long-term resistance

Once dry, the coat is approximately 300–500 μm thick. In a two-coat system, salt spray resistance can reach up to 3000 hours.

The result depends mainly on surface preparation, an even spray and keeping to the recommended thickness — a thinner coat means a shorter protection life.

Final protective coat DINITROL 4941 / CAR is not intended to be painted over. The black protective film forms the final finish.

How to protect the underbody against corrosion properly?

Effective underbody protection starts with a correct assessment of the corrosion, surface preparation and the choice of a suitable penetrating coat and top coat. In our guide you will find a practical procedure and application recommendations.

Underbody corrosion protection – procedure and choice of coating →

Specifications

Base bitumen

Colour black

Film type firm, waxy

Viscosity at 23 °C 800 mPa·s

Application temperature 15–30 °C

Wet film 500–800 μm

Dry film 300–500 μm

Drying at 20 °C 6–12 hours to dust-dry

Temperature resistance −20 °C to +130 °C

Salt spray test ISO 9227 > 2000 h at 500 μm

Two-coat system up to 3000 h

Removal hydrocarbon solvents

FAQ – What is the difference between DINITROL 4941 / CAR and DINITROL 4942?

DINITROL 4941 / CAR is a black bitumen-based protective coating. DINITROL 4942 forms a brown wax protective film. Both products are intended for long-term underbody protection but differ in composition and in the appearance of the protective coat.

What should I use if the underbody is already corroded?

First clean off the corrosion mechanically and treat the surface with a suitable penetrating product, for example DINITROL ML. The final underbody protection can then be applied.

How do I know I have applied the right thickness?

You cannot reliably tell by estimate — the difference between 300 and 500 μm cannot be judged by eye, yet it significantly changes the life of the protection. Use a coating thickness gauge and check the coat in several places.

Can the dried coat be removed?

Yes, with a hydrocarbon solvent such as white spirit. Fresh overspray outside the treated area can be removed the same way.

Safety Information (CLP)

Signal word: Warning

Hazard classification:

Flam. Liq. 3

STOT SE 3

Aquatic Chronic 3

Hazard statements:

H226 Flammable liquid and vapour.

H336 May cause drowsiness or dizziness.

H412 Harmful to aquatic life with long lasting effects.

Precautionary statements:

P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.

P243 Take action to prevent static discharges.

P280 Wear protective gloves/eye protection/face protection.

P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.

P403+P235 Store in a well-ventilated place. Keep cool.

P405 Store locked up.

Specifications

• Base: Bitumen
• Colour: Black
• Volume: 1L
• Application: Underbody corrosion protection
• Overpaintable: No
• Product type: Underbody protection