Teknodur Combi 3442-05

The paint can also be used as a topcoat in polyurethane and epoxy systems. Is suitable for steel and aluminum surfaces. The paint can be used on several different types of substrates as well as on many surfaces with old paint that has good adhesion to the substrate.

The paint gives a semi-glossy film with good mechanical properties and good weather resistance. The use of TEKNODUR 3840 polyurethane lacquer is recommended as a clear lacquer when excellent gloss and color resistance is required.

Mixing ratio (A:B) 6:1 by volume

Hardener Comp. B: TEKNODUR HARDENER 7230

Pot life, 23 °C 1.5h

Thinner If necessary, thin the paint with TEKNOSOLV 6220-00. Do not use common thinners as they may contain alcohol which will react with the hardener.

Fast thinner: TEKNOSOLV 7140-00.

Standard thinner: TEKNOSOLV 6220-00.

Slow thinner: TEKNOSOLV 6190-00.

Storage The storage stability is indicated on the label. The hardener reacts with humidity. Store cool in tightly sealed packaging. An opened hardener should be used within two weeks.

Pretreatment The surfaces are cleaned of impurities that may be harmful for pretreatment and application. In addition, water-soluble salts are removed by suitable methods. The surfaces of the various materials are pre-treated as follows:

STEEL SURFACES: Remove scale and rust by sandblasting to degree of cleanliness SA 2½ (standard ISO 8501-1). If the surface is roughened on thin sheets, the adhesion of the paint to the surface is improved.

ALUMINUM SURFACES: The surfaces are treated with a suitable cleaning agent. Surfaces exposed to the weather are roughened with sandblasting (AISaS) or sanding.

OLD PAINTED SURFACES SUITABLE FOR OVERCOATING: Impurities that can be harmful to the application of the paint (eg grease and salts) are removed. The surfaces must be dry and clean. Old, painted surfaces that have exceeded the maximum paintability must be roughened. Pre-treatment of damaged parts is carried out according to the requirements for surface and maintenance painting.

Choose the place and time for the treatment, taking into account that the pre-treated surface does not become dirty or damp before the subsequent treatment.

Other instructions regarding pre-treatment of the surface can be found in the standards EN ISO 12944-4 and ISO 8501-2.

Application method Airless spraying, Conventional spraying, Brush Suitable airless nozzle size. 0.015”-0.017”.

Application MIXING OF COMPONENTS: Consider the pot life of the mixture when calculating the amount to be mixed at one time. Before application, base and hardener are mixed in the right ratio. Carefully stir down to the bottom of the container. Inadequate stirring or incorrect mixing ratio results in insufficient curing and poorer film properties. Spray gun and container are cleaned with the paint's own thinner before use

Application conditions During application and drying, the temperature of the air, the surface and the product must be above +5 °C and the relative humidity below 80%. In addition, the temperature of the surface to be treated and the product must be at least +3 °C above the dew point of the air.

Drying time +23°C / 50% RH (dry film 80 μm) - dust dry 30 minutes (ISO 1517:1973) - non-adhesive 5 hours (DIN 53150:1995) - fully cured 7 days

Safety and preventive measures The hardener should be opened with care, as excess pressure may occur during storage. The hardener and the finished mixture contain isocyanates. In poorly ventilated rooms and especially when spraying, the use of a fresh air mask is recommended. For short or temporary work, a mask with an A2-P2 filter can be used. In this case, eyes and face must be protected. See safety data sheet.