TEKNODUR AQUA 3394-03
Polyurethane varnish
TEKNODUR AQUA 3394-03 is a water-borne two-component polyurethane varnish. The hardener is an aliphatic isocyanate resin.
The product is used as a varnish on TEKNODUR AQUA 3393 topcoats where excellent gloss and colour retention is required.
Surface preparation
Remove from the surfaces any contaminants that might be detrimental to surface preparation and application. Remove also water-soluble salts by using appropriate methods. The surfaces are prepared according to the different materials as follows:
OLD PAINTED SURFACES SUITABLE FOR OVERCOATING: Any impurities that might be detrimental to the application of paint (e.g. grease and salts) are removed. The surfaces must be dry and clean. Old, painted surfaces that have exceeded the maximum overcoating time are to be roughened as well. Damaged parts are prepared in accordance with the requirements of the substrate and the maintenance coating.
The place and time of the preparation are to be chosen so that the prepared surface will not get dirty or damp before the subsequent treatment.
Additional instructive information for surface preparation can be found in standards EN ISO 12944-4 and ISO 8501-2.
Application
MIXING OF THE COMPONENTS:
Clear varnishes with special effects must be stirred thoroughly before mixing with hardener.
The base and hardener are mixed together and stirred mechanically thoroughly before application down to the bottom of the vessel. The hardener is mixed undivided and in one go into the base. The stirring time is at least 5 min. Inadequate stirring or incorrect mixing ratio results in imperfect curing and impaired film properties.
THE READY MIXTURE MUST BE USED WITHIN THE POT LIFE, MIXTURES OLDER THAN THIS ARE UNFIT FOR USE.
Application conditions
During the application and drying period the temperature of the ambient air, the surface and the product shall be above +10 °C and the relative air humidity below 70%. Additionally, the temperature of the surface to be treated and the product must be at least +3°C above the dew point of the ambient air.
Especially when applying with a spray the relative air humidity should be above 30% to avoid the onset of the drying process to be too fast.
Storage
The storage stability is shown on the label. Store indoors in a cool and dry place and in a tightly closed can.
The hardener reacts with air humidity and therefore the opened can is to be kept carefully closed, and it is recommended to be used within 14 d of opening.
Clear varnishes with special effects must be stirred thoroughly before mixing with hardener.
Nozzle size 0.011 - 0.013".
Conventional spray gives the best result.
| Volatile organic compound (VOC) | abt. 32 g/l |
|---|---|
| Pot life | 3h (+23 °C) |
| Mixing ratio | 9:1 by volume (comp. A : comp. B) |
| Hardener | Comp. B: TEKNODUR HARDENER 7323-03 |
| Practical spreading rate | The values depend on the application technique, surface conditions, overspray, etc. |
| Drying time – dust free | 30 minutes (ISO 1517:1973) |
| Drying time – touch dry | 2 hours (DIN 53150:1995) |
| Thinner | Water. The components are not to be thinned separately. |
| Clean up | When painting equipment used for application of solvent-borne paints is used for water-borne paints the equipment must be cleaned carefully: 1. Wash with solvent. 2. Wash with washing solvent for water-borne paints, e.g. TEKNOSOLV 6060-00. 3. Rinse with water. When shifting from water-borne to solvent-borne paints act in reverse order. Water, TEKNOSOLV 7030-00. |
| Colours | Clear. |
| Safety markings | The hardener can must be opened with caution, as pressure may develop in the can during storage. The hardener of the product and the ready mixture contain isocyanates. In poorly ventilated areas and especially when using spray application we recommend the use of a fresh air mask. In short or temporary work, a mask with combined filter A2-P2 can be used. In this case eyes and face are to be protected. See safety data sheet. |