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Fortis Eco Prime 520 is a water based, two pack, aliphatic polyurethane primer.

  • It is non toxic,

  • contains no harmful solvents

  • no noxious odours.

  • environmentally friendly.


Fortis Eco Prime 520 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.


  • 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 litre


Recoat time:

As soon as it is walk-able, however in colder weather conditions allow up to 12 hours between coats

Size Available



Frequently Asked Questions

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