
Sikalastic®-503 Primer
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A Two Component, high solids, cool roof, polyurethane liquid applied primer with unique penetrating characteristics.
- High Solids
- Fast Re-Coat Time
- Low Odor
- Low Viscosity
Usage
Primer for use with Sikalastic®-500 RoofCoat SystemsSuitable for use on:
- PVC
- FPO
- Intercoat Adhesion & re-coat primer for existing urethane systems
Advantages
- High Solids
- Fast Re-Coat Time
- Low Odor
- Low Viscosity
Packaging
2 gal. (7.6 L) kit
- Part A: 1 gal. (3.8 L)
- Part B: 1 gal. (3.8 L)
10 gal. (37.8 L) kit
- Part A: 5 gal. (18.9 L)
- Part B: 5 gal. (18.9 L)
Color
Part A: Black
Part B: White
Product Details
Chemical Base
Two component Polyurethane
Shelf Life
12 months in unopened container
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
Solid Content
97.8 % by weight | (ASTM D-2369) |
97.7 % by volume | (ASTM D-2697) |
Volatile organic compound (VOC) content
25 g/L | (ASTM D-2369-81) |
Viscosity
500 cps. (at 75 °F (24 °C) and 50 % R.H. Part A+B)
Application
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, and primer exposed to water during curing and exhibiting a chalky appearance, must be reprimed. Deteriorated primer must be mechanically removed before primer reapplication.
Coverage
1 gal/ Average 300 sq. ft. (0.14 L / m²)
Note: Rough, porous, or absorbent surfaces will require additional primer andwill reduce yield.
MIXING
The volume mixing ratio is 1 part Part-A Black Liquid to 1 part Part-B White Liquid.
APPLICATION
Sikalastic®-503 Primer should be applied at the rate of 1 gal. (3.8 L) (mixture of Part-A & Part-B) / 300 ft2 (27.9 m2). 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.