Sikalastic-590 20Kg

Sikalastic-590 20Kg | ECONOMICAL LIQUID APPLIED ROOF WATERPROOFING WITH IMPROVED PONDING WATER CAPABILITY
Product Category: Roof Waterproofing Coating
Brand: Sika
Model Code: Sikalastic®-590
Description
Sikalastic®-590 is a 1-component polyurethane-acrylic waterproofing coating, designed to form a seamless, elastic membrane with excellent resistance to UV, weathering, and ponding water. It is suitable for both new construction and roof refurbishment projects.
Applications
Roof waterproofing (new and repair works)
Complex roof structures and detailing
Refurbishment of existing roofs
Reflective coating to reduce heat (white version)
Key Features
Excellent resistance to ponding water
UV resistant and weatherproof
High elasticity and crack-bridging
Seamless waterproof membrane
Water vapour permeable
Strong adhesion to many substrates
Ready-to-use, one-component
Eco-friendly, low VOC
Product Information
Type: Polyurethane-acrylic dispersion
Packaging:
4 kg pail
20 kg pail
Colour: Grey, White
Shelf Life: 12 months
Storage: +5°C to +30°C, dry conditions
Density: ~1.32 kg/L
Solid Content: ~63%
Technical Data
Tensile Strength: ~1.7 N/mm²
Elongation at Break: ~360%
Adhesion: ~1.5 N/mm²
Weathering Resistance: No cracking or blistering (1000 hrs test)
Reflective Performance (White)
Solar Reflectance: ~80%
Thermal Emittance: ~0.91
SRI: ~100.9
System Options
1. Standard Coating (No Reinforcement)
Layer
Consumption
Primer (10% diluted)
~0.3 kg/m²
First coat
~0.5 kg/m²
Second coat
~0.5 kg/m²
2. Reinforced System (Recommended)
Layer
Consumption
Primer
~0.3 kg/m²
First coat
~0.3 kg/m²
Second coat
~0.5 kg/m²
Reinforcement
Sika®-120 Reemat
Third coat
~0.5 kg/m²
Final coat
0.3 – 0.5 kg/m²
Application Conditions
Temperature: +15°C to +35°C
Humidity: Max 80%
Substrate moisture: <6%
≥3°C above dew point
Curing & Drying
Condition
Time
Touch dry
~1–2 hours
Rain resistant
~6–10 hours
Fully cured
~2–4 days
Substrate Preparation
Concrete must be:
≥28 days cured
Pull-off strength ≥1.5 N/mm²
Surface must be:
Clean, dry, sound
Free from dust, oil, grease
Remove:
Weak concrete
Old coatings
Repair cracks and voids before application
Application Method
Standard System
Apply primer (diluted 10% water)
Apply first coat
Apply second coat after drying
Reinforced System
Apply primer
Apply first coat
Embed Sika Reemat (overlap ≥5 cm)
Apply additional coats
Finish with top coat
Important Limitations
Do NOT use:
On substrates with rising moisture
On insulation boards directly
In freezing or cold climate ponding conditions
Where permanent water immersion occurs
Important Notes
Protect from rain for at least 24 hours
Apply during falling temperature to avoid pinholes
Do not allow water ponding between coats
This is an exposed system (not for tiling over)
Performance Advantages
Long-term roof protection
Excellent for tropical climate (Cambodia)
Reflective version reduces heat and cooling cost
Suitable for complex roof shapes
Cost-effective waterproofing solution
Safety & Handling
Follow SDS guidelines
Use PPE
Clean tools with water immediately
Additional Notes
Lab-tested data
Site conditions may affect results
Local regulations may vary
Summary
Sikalastic®-590 is a durable, UV-resistant waterproofing coating designed for roof protection and refurbishment, offering high elasticity, ponding water resistance, and energy-saving reflective performance, making it ideal for long-term exposed waterproofing systems.