Product Data Sheet
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Sikalastic®-503 Primer

Two component Polyurethane primer for PVC & TPO substrates

Two component, high solids, cool roof, polyurethane liquid applied primer with unique penetrating characteristics

  • High Solids
  • Fast Re-Coat Time
  • Low Odor
  • Low Viscosity
Product Data Sheet
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Usage

  • For use with Sikalastic® -500 RoofCoat products
  • PVC*
  • TPO*
  • Intercoat adhesion & re-coat primer for existing urethane systems
     
*Some surfaces may be manufactured with a lacquer finish, contact Sika if pull/adhesion test yields less than required pli  

Advantages

  • High Solids
  • Fast Re-Coat Time
  • Low Odor
  • Low Viscosity

Packaging

2 gal. kit

  • Part A: 1 gal
  • Part B: 1 gal

Colour

Part A - black
Part B - white

Product Details

Product Information

Chemical Base

Two component Polyurethane

Shelf Life

12 months

Storage Conditions

Keep containers closed and store in a dry, cool place away from direct sunlight, heat, sparks, open flame, and moisture. Keep material stored above 65 °F (18 °C). Open containers should be blanketed with dry nitrogen before resealing.

Density

Part A: 1.22 kg/l
Part B: 0.98 kg/l

Viscosity

500 cps. (at 75 °F (24 °C) and 50 % R.H. Part A+B)

Volatile organic compound (VOC) content

25 g/L

(ASTM D-2369-81)

Application

Application Information

Mixing Ratio

Part A : Part B =   1 : 1  (by volume)

Ambient Air Temperature

41 °F (5 °C) min. / 104 °F (40 °C) max.

Relative Air Humidity

80 % R.H. max.

Dew Point

Beware of condensation.
The substrate and uncured coating must be ≥ 5 °F (3 °C) above dew point.

Substrate Temperature

41 °F (5 °C) min. / 140 °F (60 °C) max.

Pot Life

60–90 minutes (at 75 °F (24 °C) and 50 % R.H. Part A+B)

Waiting / Recoat Times

Allow primer to cure completely prior to applying membrane resin.
Full cure: 2 - 4 hours at 68°F.
Maximum primer exposure is 12 hours. Primer exposed longer than 12 hours, exposed to water during curing and exhibiting a chalky appearance, must be reprimed. Deteriorated primer must be mechanically removed before reapplication.
Application steps

MIXING

The volume mixing ratio is 1 part, Part-A (black liquid) into 1 part, Part-B (white liquid). Mix until even color distribution.

APPLICATION

Sikalastic®-503 Primer should be applied at the rate of 1 gal (mixture of Part-A & Part-B) / 300 ft2. Coverage rate will depend on surface roughness and porosity. It can be applied using an airless sprayer, brush, or phenolic resin core roller. Do not allow the material to puddle.

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