Product description

Brush-on primer for surface pretreatment before floor levelling. Flow Primer improves the adhesion of floor levelling compounds, reduces or eliminates the formation of air bubbles, and prevents water contained in the floor levelling compound from being absorbed into the surface too quickly. For indoor use. 

  • Brush-on primer for floor plasters
  • Dries quickly
  • Easy to spread
  • High spreading capacity
  • Make pumped levelling plasters easier to spread
  • Prevents the creation of air bubbles


  • Hollow-core slabs
  • Cast-in-place concrete floors
  • Cement-based levelling compounds
  • Plasterboards and chipboards
GTIN code Product name Product number Package size
6416841769053 FLOW PRIMER 10 L 76905 10 l

Pretreatment of the base

  • Remove dirt, dust, cement paste and all loose material from the base
  • If necessary, perform machine grinding, centrifugal blast cleaning or diamond grinding

Mixing ratio

  • Concrete surfaces and surfaces with cement-based levelling: 1 part Flow Primer, 3 parts water
  • Surfaces that cannot withstand moisture, e.g. plaster and wood surfaces: Use undiluted
  • Mix before use by swirling the package; avoid shaking

Applying the primer

  • The Primer is applied as a thin, even layer by brushing
  • The Primer must be dry before the floor levelling compound is applied (1 to 4 hours, depending on the conditions)
  • Highly absorbent surfaces (e.g. cast-in-place concrete floors) are primed twice.If air bubbles form in the surface of the floor levelling compound, it usually indicates insufficient priming
  • Wash tools and equipment with water immediately

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

Material usage

Hollow-core slab surfaces: finished mixture (mix ratio 1:3) about 10 m2/l

Cast-in-place concrete surfaces: finished mixture (mix ratio 1:3) about n. 5 m2/l

Plaster and wood surfaces (undiluted): about 7 m2/l

Type liquid
Package size 10 l container

in a cool room, not below +6°C, up to 1 year in a hermetically sealed original container

Lowest usage temperature

the temperature of the underfloor structure and the inside temperature must be at least +10°C

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.