Adhesion promoter

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Product description

Fescon Adhesion promoter is a water-soluble primer for pretreatment of the base. The primer is used as part of the Fescon waterproofing system. Also suitable for all Fescon floor leveling compounds and wall filler, to improve the stress category of wall fillers. Improves adhesion to the substrate, absorbs dust, prevents the formation of air bubbles, and prevents the water in the leveling compound from being absorbed too quickly into the substrate. For indoor use. Pack size 5 x 3 ltr / box and 10 x 1 ltr / box. 

The primer is part of the Fescon waterproofing system. Certificate No. VTT-C-870-06. 

  • Primer used in the Fescon waterproofing system
  • Can be used with all Fescon floor leveling compounds
  • The primer can improve the durability of wall fillers



  • Adhesion promoter for Fescon Waterproofing system
  • Hollow slabs
  • Concrete floors cast on site
  • Cement-based levelling compounds
  • Gypsum boards, and uncoated wood-based construction boards
GTIN code Product name Product number Package size
6416841259110 ADHESION PROMOTER 1 L 25911 1 l
6416841259103 ADHESION PROMOTER 3 L 25910 3 l
6416841259042 ADHESION PROMOTER 10 L 25904 10 l
  • The substrate must be clean, dust-free, solid and immobile
  • Loose layers, cement paste, and other impurities have been mechanically removed to ensure adhesion.
  • The temperature of the underlaying structure is > +10°C and relative humidity < 95% RH.
  • When performing waterproofing, the relative humidity must be < 90% 
  • The relative humidity of the subfloor affects the drying of the leveling compounds
  • Concrete and cement-based levelling compounds: 1 part of primer and 3 parts of water
  • Bases that do not tolerate moisture, such as plaster and wood: do not thin
  • Mix the product before use by turning the package avoid shaking.
  • Fescon primer is spread thinly with a brush. Fescon primer must not be applied so much that it creates puddles.
  • Fescon primer must be dry before the waterproofing compound or leveling compound is spread (1–4 hours, depending on the conditions).
  • Highly absorbent substrates (such as in-situ cast concrete floors or renovated floors) are primed twice. The first layer with a ratio of 1:5 (1 part primer, 5 parts water), and the second layer with a ratio of 1:3.
  • If air bubbles form on the surface of the floor leveling compound, it is generally a sign of insufficient priming.
  • Wash tools and equipment with water immediately.
Other points to note
  • For non-absorbent surfaces (e.g. ceramic tiles, epoxy, metal), use Primer PLUS as instructed.
  • The stress category of wall fillers can be improved by replacing 10% of the water with primer. This improves the stress category to RL 04.

Storage and handling of waste
See the separate storage and disposal instructions

Material usage

hollow-core and cement-based leveling compound substrates: ready mixture (ratio 1:3) approx. 10²/l

concrete substrates cast in situ: ready mixture (ratio 1:3) approx. 5 m²/l

gypsum board and wood substrates (undiluted): approx. 7m²/l

Type liquid
Package size 1 l, 3 l, 10 l

in a cool place, not below +6°C, in a tightly closed original container for up to 2 years


1 l = 1 kg

Usage temperature

+10°C…+25°C (base and indoor temperature)

Drying time

1-4 h depending on the conditions

Thinner water
Method of application brushing
Transport warm transport
Limitation of liability, product use notes and restrictions: Please familiarize yourself with Fescon Oy's general terms of delivery and the design and work instructions related to the product.