Fortis 520 Eco Prime

Fortis 520 Eco Prime is a water based, two pack, aliphatic polyurethane primer. It is non toxic, contains no harmful solvents and has no noxious odours. Fortis 520 Eco Prime is suitable for brush or roller application as a high performance clear polyurethane primer for wood and concrete substrates. Usually finished with Fortis Coat 526 or Fortis Coat 519. Highly scratch and chemical resistant with a medium solids content. Easy to apply, washes up in water and is environmentally friendly.

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Additional Information


  • Medium build 2 pack water based
  • Non-Yellowing.
  • Low Odour
  • Chemically bonds to siliceous and most polar compounds.
  • Cures well in humid and cold conditions.

(Approximate Coverage = 10-12m2 per ltr)

Technical Data

Frequently Asked Questions

What is the minimum re-coat time for Fortis 520?

In general, as soon as it is walkable, however in colder weather conditions allow up to 12 hours between coats.

After mixing, Fortis 520 it has turned a little bit like jelly?

Part A must be mixed 1st, then slowly pour part B into a vortex while still mixing part A.

Can Fortis 520 be used over self leveling compounds?

Yes, however the leveling compound must contain at least 15% silica.

What is the mixing rate by weight

Approx 4.1:1