Millennium One Step™ Night Seal®

1 of 41 products in this brand
Millennium One Step™ Night Seal® is a highly elastomeric, solvent-free, quick-setting foam sealer. The unique formulation results in a foam that has a weatherproof "skin". Millennium One Step™ Night Seal® sets in minutes and is designed for use with our One Step™ application process. It is efficient and always dependable. The application process is quick and easy, resulting in significant labor savings for the contractor. No expensive specialty pumps or spray rigs are required.

Chemical Family: Urethanes

Product Type: 2K (2 component) Adhesive, Foam Sealer, Reactive Adhesive, Sealer

Application Area: Roofing Substrates, Roofs

Features: Fast Setting, Flexible, Good Weather Fastness, Low Foaming

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Identification & Functionality

Features & Benefits

Labeling Claims
Ready-to-Use Product Features
Key Attributes
Features Benefits

Requires no pre-mixing, reduces labor costs

No temperature restrictions

Suitable for all climates

One Step™ Technology Easy to apply
Solvent free

Essentially VOC free, no odors


Remains flexible, absorbs stresses

Low rise foam

Accommodates minor surface irregularities

Unique weatherproof “skin”

Waterproof tie-ins within minutes

Applications & Uses

Application Area
Recommended Applications

Millennium One Step™ Night Seal® is designed for use as a quick and reliable sealer at temporary tie-in locations between new roof covers and existing roof systems. Millennium One Step™ Night Seal® eliminates the need for messy asphalt mastics and bitumens or less reliable porous surface foams.

  • Do not apply to wet or damp surfaces.
  • Not intended for insulation attachment.
  • Not intended as a permanent weatherproofing sealant.
Application Method
  1. Remove snap off tip from the One Step™ mixing head and keep for re-use.
  2. Attach a One Step™ mixing nozzle to the threaded mixing head.
  3. Place the cartridge into the appropriate One Step™ applicator. Caution: Adhesive should be dispensed immediately after loading the cartridge into the dispensing tool to prevent adhesive from foaming and curing in the mixing tip.
  4. Properly prepare existing membrane and/or substrate at temporary tie-in location. The surface to receive Millennium One Step™ Night Seal® must be dry, clean, and free of loose material. All loose gravel must be removed.
  5. Apply Millennium One Step™ Night Seal® directly to the prepared substrate. Apply a continuous bead (minimum 3/4” width) approximately 1-1/2” from where the roof covers leading edge will fall. As the sealer is applied immediately place edge of the roof cover into the wet material. Do not allow the material to skin over.
  6. Roll the outside edge of the roof cover to ensure positive contact with the substrate and to create a sufficient “bleed out” of sealer. Millennium One Step™ Night Seal® will expand and seal the leading edge of the roof cover.
  7. Un-used material can be applied at a later date by simply plugging the cartridges (with provided snap off tip) and using a new One Step™ mixing Nozzle.


The fast and dependable One Step™ applicators make applying Millennium One Step™ Night Seal® simple:

  • Battery Powered Single Bead Applicator
  • Pneumatic Single Bead Applicator
  • Ultra Drive Manual Applicator
  • Heavy Duty Manual Applicator


Covers 300 - 400 lin ft (91m - 122m) per case. Coverage rates are based on an application of one continuous ribbon approximately 3/4” (1.9cm) in width. Coverage rates will vary depending on surface conditions. Extremely irregular surfaces may require the use of a larger bead of material.



Packaging & Availability

Packaging Type
Regional Availability
  • Africa
  • Australia & New Zealand (ANZ)
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America
  • South East Asia
Packaging Information

Millennium One Step™ Night Seal® is available in the following package:

Cartridge Size Part # Cartridges/Case
1.5 Liter OS-NS15-04 4

Storage & Handling

Storage Conditions

Keep temperature of contents between 65°F to 85°F (18°C to 29°C) 24 hours prior to use. Do not store in direct sunlight or temperatures higher than 90°F (32°C).