The Dacfill system is designed to have 350% elasticity, is 100% waterproof, vapour permeable and provides excellent resistance against extreme variations in temperature, atmospheric pollution and UV rays.

Dacfill dries to an abrasion resistant, rubber-like coating without joints or seams, is non-flammable and self-extinguishing. It Conforms to BS 476-3: 1958. It is designed for use over asbestos and cement fibre, concrete, hard PVC, polyester, metal roofing, bituminous materials, zinc, galvanized steel, copper, lead and aluminium. It is not for use on tar, soft PVC or bituminous materials less than 1 year old.


Clean substrate with water under high pressure (200 bars), and dry. Fill all joints with Rust-Oleum Elastofill, bridging active gaps with Dacfill Bridging Fleece or Overbridging Mesh.

General information

Uniclass 2015

Pr_35_31_68_01 Acrylic-based waterproof coatingsPrimary


J31/5 Cold deck roof coating

J31/10 Warm deck roof coating

J31/130 Inverted roof coating

J31/110 Cold deck roof coating

J31/120 Warm deck roof coating

Specification data - Acrylic-based waterproof coatings

Product Reference



Not required

Noxyde diluted with 25% water

Primer No 44 diluted with 30% Thinner No 22

Undiluted Noxyde

Coating application

Two coats Dacfill, roller, brush or airless spray applied

Rate of application

0.6–1.5 kg/m²

1.3–2.5 kg/m²

2.5–3 kg/m²


Not required

Dacfill Fleece

Minimum dry film thickness

600 micrometres


Pearl Grey






Coating protection

Not required

Coating PRT

Standard product features

AFNOR Classification:

Group II, class 7b2.

Density (ASTM D1475, 20°C):

1.49–1.55 g/cm³.

Drying time at 20°C:

  • Dust free: 2 hours.
  • Rain resistant: 6 hours.
  • Re-coatable: 24 hours.
  • Full cure: 1 week.

Actual drying times are dependent on relative humidity, temperature and composition of the material; consult with Rust-Oleum Technical Department for further details.

Flashpoint (DIN 53213):


Solids content (ASTM D1644/a):

In volume 57–60%. In weight: 71–74%.

Product Options


  • Porous concrete, hard PVC and polyester substrates. 5–10 m²/litre. Primer No 44 diluted with 30% Thinner No 22.
  • Smooth non-porous concrete: 100 g/m² Noxyde diluted with 25% water.
  • Iron and steel: Undiluted Noxyde.
  • Bituminous materials over 1 year old, zinc, galvanized steel, copper, lead and aluminium: Primer not required.

Coating - rate of application:

  • Roofs less than 5% slope, well drained: 0.6–1.5 kg/m².
  • Roofs less than 5% slope with risk of standing water (with fleece): 2.5–3 kg/m².
  • Roofs more than 5% slope (without fleece): 1.3–2.5 kg/m².


Dacfill Fleece (polyester fibres woven in hexagonal meshes) embedded in the first coat of Dacfill is recommended on roofs with pitches between 1° and 5° or where movement of the substrate is to be expected.

Coating colour:

A range of six standard colours. For other colours please contact Rust-Oleum UK Ltd.

Coating protection:

For applications where standing stagnating water is possible or when the Dacfill coat has to be protected against pollution (e.g. Dacfill white), an application of Coating PRT (6–8 m²/litre) is recommended.

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