Product Data Sheet
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Sikalastic®-390

Sikalastic®-390

Two-component, solvent-free, aromatic polyurethane waterproofing base coat

Sikalastic®-390 is a two-component, aromatic, chemically cured, elastomeric polyurethane coating intended for use as the waterproofing base coat under Sikalastic®-391 or Sikalastic®-395 intermediate and top coats and under Sikadur® 22 Lo-Mod epoxy wearing surfaces for pedestrian and vehicular traffic bearing applications.

  • Low odor and fast turnaround
  • Excellent crack-bridging properties and flexibility, even at low temperatures
  • Impervious to water and deicing salts
Product Data Sheet
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Usage

  • Multi-story parking garages
  • Parking decks and ramps
  • Foot bridges and walkways
  • Mechanical rooms
  • Stadiums and arenas
  • Plaza and rooftop decks
  • Balconies
 

Advantages

  • Low odor and fast turnaround
  • Excellent crack-bridging properties and flexibility, even at low temperatures
  • Impervious to water and deicing salts

Packaging

5 gal. two component kit, 3.33 gal. comp. A, 1.67 gal. comp. B.

Color

Brown

Product Details

Product Information

Shelf Life

12 months in original, unopened containers

Storage Conditions

Store dry at 41–95 °F (5–35 °C).

Condition material to 65–85 °F (18–30 °C) before using.

Solid content by volume

100 %

(ASTM D-2697)

Volatile organic compound (VOC) content

< 10 g/l

(ASTM D-2369-81)
Technical Information

Shore A Hardness

80 +/- 5

(ASTM D-2240)

73 °F (23 °C)
50 % R.H.

Abrasion Resistance

6 mg loss

(ASTM D-4060)

Taber Abraser, CS-17 Wheel:
1000 g (2.2 lb)/1000 cycles

Tensile Strength

1,320 psi

(ASTM D-412)

73 °F (23 °C)
50 % R.H.

Tear Strength

218 pli

(Die C, ASTM D-624)

73 °F (23 °C)
50 % R.H.

Chemical Resistance

Resistant to de-icing salts.

Application

Application Information

Pot Life

15–20 minutes
Consumption

Coverage

80 f2/gal. at 20 wet mils (20 dry mils)

NOTE: Surface texture and porosity can affect coverage rate.
Application steps

MIXING

Premix Part A and Part B components using a slow speed (400–600 rpm) drill and mechanical mixer (Jiffy) to obtain uniform color, making sure to scrape the solids from the bottom and sides of the pail. Pour part B into Part A slowly and while mixing scrape the side of the container, Mix the combined material thoroughly until a homogenous mixture and uniform color is obtained (typically 3 minutes). Use care not to allow the entrapment of air into the mixture.

APPLICATION

Apply at the recommended coverage rate (see appropriate System Guide) using a 3/16” notched squeegee or trowel, and back roll using a phenolic resin core roller. Extend base coat over entire area including previously detailed cracks and joints. Allow coating to cure a minimum of 5–6 hours at 70 °F and 50 % R.H.; base coat must be tack free before over coating.

  

Removal

Remove liquid coating immediately with dry cloth. Once cured, coating can only be removed by mechanical means.

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