Sikalastic®-503 Primer
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
- For use with Sikalastic® -500 RoofCoat products
- PVC*
- TPO*
- Intercoat adhesion & re-coat primer for existing urethane systems
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
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
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.
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.