TEKNODUR PRIMER 3420-01

Polyurethan primer

  • 2-component
  • Primer
  • Solvent-borne

TEKNODUR PRIMER 3420 is a two-pack polyurethane primer. The hardener is an aliphatic isocyanate resin.

TEKNODUR PRIMER 3420 is a high quality and versatile topcoat for steel-, zinc and aluminium surfaces. The main fields are the basic coatings of transporting vehicles and technical facilities.

TEKNODUR PRIMER 3420 is a quick-drying and good filling primer with a plain surface.

Surface preparation

Remove from the surface any contaminants that might be detrimental to surface preparation and coating. Remove also water-soluable salts by using appropriate methods. The surface should be prepared as follows: STEEL SURFACES: Remove mill scale and rust by blast cleaning to preparation grade Sa 2½ (standard ISO 8501-1). Roughening the surface of thin-plate improves the adhesion of the paint to the substrate. ZINC SURFACES: Hot-dip-galvanized steel structures that are exposed to atmospheric corrosion can be painted if the surfaces are sweep blast-cleaned (SaS) till matt all over. Suitable cleaning agents are, e.g. aluminium oxide and natural sand. It is not recommended to paint galvanized objects that are subjected to immersion strain. It is recommended that new zinc-coated thin-plate structures are treated with sweep blast-cleaning (SaS). Surfaces that have been weathered to matt can be treated also with PELTIPESU Cleaning Agent. OLD PAINTED SURFACES SUITABLE FOR OVERCOATING: Any impurities that might be detrimental to the application of paint (e.g. grease and salts) are to be removed. The surface must be dry and clean. Old, painted surfaces that have exceeded the maximum overcoating time are to be roughend as well. Damaged parts are prepared in accordance with the requirements of the substrate and the maintenance coating.
Solids abt. 46 % by volume
Weight solids abt. 63 % by weight
Volatile organic compound (VOC) abt. 480 g/l
Pot life 4 h (+23 °C)
Mixing ratio 7:1 by volume (comp. A : comp. B)
Hardener Comp. B: TEKNODUR HARDENER 7255
Gloss Semi-matt
Recommended film thickness The recommended maximal film thickness is 100 µm dry film.
Drying time – dust free after 30 min
Drying time – touch dry after 2,5 h
Drying time – forced drying 60°C / 30 min
Drying time - overcoatable after 16 h by +5°C / after 2h by +23°C
Thinner Standard dilution: TEKNOSOLV 6740
Clean up TEKNOSOLV 6740