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Bleed Blocker

Water Resistant Acrylic Base Coat for Smooth Asphalt Surfaces

Bleed Blocker is a plasticizer-free, single-component, water-based, 100% acrylic elastomeric coating engineered for maximum adhesion and bleed-through resistance over smooth asphalt—even in the presence of water. It is formulated to act as a barrier that blocks discoloration, keeping asphaltic bleed from staining the finished system.

Designed as a base coat for built-up and modified bitumen substrates, Bleed Blocker may be used over smooth or granulated surfaces and adheres to most aluminized coatings (adhesion should be verified before application). Reinforced with polyester mesh fabric it is designed to tolerate some standing water, and it breathes—providing a completely watertight membrane while allowing trapped moisture to escape.

Features & Benefits

Blocks Bleed-Through and Discoloration
  • Formulated to act as a barrier that blocks discoloration
  • Maximum bleed-through resistance over smooth asphalt surfaces
  • Protects the appearance and performance of the finish coat
Adheres Even in the Presence of Water
  • Maximum adhesion over smooth asphalt, even in the presence of water
  • Designed to tolerate some standing water when reinforced with fabric
  • Adheres to most aluminized coatings—verify adhesion before application
Breathable, Watertight Membrane
  • Provides a completely watertight membrane
  • Breathes so trapped moisture can escape rather than blister the system
  • Rated at 3 perms (ASTM D-1653)
Elastomeric Performance in Heat and Cold
  • 980% ±25 elongation with 100 psi ±25 tensile strength
  • Passes 180° flex over a 1/8" mandrel at –30°F (ASTM D-522)
  • Service temperature range of 0°F to 185°F
Clean, Low-VOC Chemistry
  • Plasticizer-free, single-component, 100% acrylic formulation
  • Water-based with less than 50 g/liter VOC (Method 24)
  • Not regulated for DOT, IMDG, or IATA transport
Where to Use It
  • Smooth-surface built-up roofing (BUR)
  • Modified bitumen membranes
  • Smooth or granulated asphaltic substrates
  • Low areas and waterways when combined with reinforcing fabric
  • As the base coat beneath a suitable NanoTech top coat—consult your representative for top coat recommendations

Technical Highlights

  • Resin Type: Plasticizer-free, single-component, water-based 100% acrylic elastomeric
  • Tensile Strength: 100 psi ±25 (ASTM D-2370)
  • Elongation: 980% ±25 (ASTM D-370)
  • Perms: 3 (ASTM D-1653)
  • Solids by Weight: 65% ±2 (ASTM D-370)
  • Solids by Volume: 50% ±2 (ASTM D-1644)
  • Density: 11.4 lbs/gal (ASTM D-370)
  • VOC: <50 g/liter (Method 24)
  • Flash Point: >212°F (ASTM D-1310)
  • Temperature Limit: 0°F to 185°F
  • Low Temp Flexibility: Passes 180° flex over 1/8" mandrel at –30°F (ASTM D-522)
  • Dry Time: 5 hours at 75°F and 50% humidity
  • Complete Cure: 24 hours minimum—longer in cool or high-humidity conditions
  • Coverage Rate: 1 gallon per square (100 sq ft) per coat in the waterway/low-area system
  • Color / Finish: Ivory – Satin Flat
  • Packaging: 55-gallon drum (208.2 liters) and 5-gallon pail (18.9 liters), Shipping Class 55
  • Application Methods: Brush, roller, or spray; hand application by squeegee and roller
  • Spray Equipment: 3,000 psi at 2.5–3.0 gal/min, .017–.029 reversible self-cleaning tip, 40–50° fan
  • Application Conditions: Above 32°F ambient; not within 5°F of the dew point for 6 hours after application
  • Storage: 33.8°F to 120.2°F, protect from freezing; 12-month storage period
  • Transport Classification: Not regulated (DOT, IMDG, IATA)

AI responses are based on product documentation and are generally accurate, but should always be confirmed with a NanoTech Materials representative for critical applications.

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Where this product is used

Take Action Today and Stop Asphalt Bleed Before It Starts

Asphaltic bleed can discolor a finished roof long after the crew has packed up. Bleed Blocker shuts that down at the base coat—bonding to smooth asphalt even in the presence of water, tolerating some standing water when reinforced with fabric, and breathing so trapped moisture escapes instead of blistering the system. Paired with a suitable top coat, it forms an exceptional protective system for asphaltic membranes.