Sika® Bonding Primer
Two-component waterbased epoxy primer
Sika® Bonding Primer is a two-component, water-based epoxy primer to consolidate substrates and enhance the adhesion of Sikalastic® RoofPro and Sikafloor® systems.
- Fast curing - overcoat possible after 1–2 hours
- Long pot life - up to 12 hours
- Low odor - water-based product
- Low VOC
- Consolidates dusty or friable surfaces
- Uniforms the absorbency of the substrate
- Enhances adhesion to a broad range of substrates
- Easy application by brush or roller
Usage
Versatile primer for use with:- Sikalastic® RoofPro Systems
- Sikagard® and Sikafloor® Systems
- Suitable for use on concrete, masonry, tiles, insulation foams, bituminous surfaces, plaster, cementitious renders, screeds and mortars.
Advantages
- Fast curing - overcoat possible after 1–2 hours
- Long pot life - up to 12 hours
- Low odor - water-based product
- Low VOC
- Consolidates dusty or friable surfaces
- Uniforms the absorbency of the substrate
- Enhances adhesion to a broad range of substrates
- Easy application by brush or roller
Packaging
Bonding Primer Kit: 1 gal. (3.8 L), 5 gal. (19 L)
Part A: 0.8 gal. (3 L), 4 gal. (15 L)
Part B: 0.2 gal. (0.7 L), 1 gal. (3. 8 L)
Product Details
Chemical Base
Epoxy, waterborne and polyamine curative
Shelf Life
24 months from date of production
Storage Conditions
The product must be stored properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures between 41 °F (5 °C) and 77 °F (25 °C). Higher storage temperatures may reduce shelf life of product. Reference shall also be made to the storage recommendations within the safety data sheet.
Density
| ~1.03 kg/l (73 °F, 23 °C) |
Solid Content
| 15 % by volume | (ASTM D-2697) |
Volatile organic compound (VOC) content
| 12.5 g/l | (ASTM D-2369-81) |
Service Temperature
-22–176 °F (-30–80 °C) intermittent.
Application
Mixing Ratio
Component A : Component B = 4:1 (by volume)
Ambient Air Temperature
41 °F (5 °C) min. / 104 °F (40 °C) max.
Relative Air Humidity
80 % R.H. max.
Substrate Temperature
41 °F (5 °C) min. / 140 °F (60 °C) max.
Dew Point
Beware of condensation.
The substrate and uncured coating must be ≥ 5 °F (3 °C) above dew point.
Substrate Moisture Content
≤ 4 % moisture content Test method: Sika®-Tramex meter
No rising moisture according to ASTM (Polyethylene-sheet).
Pot Life
12 hours
Waiting / Recoat Times
Before applying any recommended Sikalastic® RoofPro resin on Sika® Bonding Primer, allow:
| Substrate temperature | Minimum waiting time | Maximum waiting time |
| 50 °F (10 °C) | 4 hours approx. | 7 days |
| 68 °F (20 °C) | 2 hours approx. | 7 days |
| 86 °F (30 °C) | 1 hour approx. | 7 days |
Before applying Sikagard® and Sikafloor® products on Sika® Bonding Primer allow:
| Substrate temperature | Minimum waiting time | Maximum waiting time |
| 50 °F (10 °C) | 24 hours approx. | 7 days |
| 68 °F (20 °C) | 8 hours approx. | 7 days |
| 86 °F (30 °C) | 6 hours approx. | 7 days |
Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
Ideally, membrane resin will be applied within 24 hours of primer application. This is required for applications in tropical/subtropical environments to avoid UV-related primer deterioration. Maximum primer exposure is 7 days. Primer exposed longer than 7 days, and primer exposed to water during curing and exhibiting a chalky appearance, must be reprimed. Deteriorated primer must be mechanically removed before primer reapplication
SUBSTRATE PREPARATION
All surfaces to be coated should be thoroughly cleaned by conventional means.
Inspect the substrate.
Spalling, flaking or damaged areas should be repaired using compatible materials to match surroundings or replaced as necessary.
If in doubt apply a test area first.
Tiles have to prepared mechanically, glazing has to be removed.
Grinding may be necessary to level the surface.
For detailed information regarding substrate quality / preparation and primer chart please refer to Sikalastic® RoofPRO Application Manual.
MIXING
Mix ratio is 4:1 (A:B) by weight and volume. Add Part B into Part A and mix with stir stick or mechanical mixer (Jiffy) at low speed. Avoid adding air into the primer during mixing. When fully mixed, the primer should be free from streaks and of a uniform light green color.
Do not break down kits into smaller quantities.
APPLICATION
Apply by brush or phenolic resin core roller at the recommended rate. Correct amount of primer will saturate the substrate and leave a slight film on the substrate top surface. Apply evenly without puddling.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened and/or cured material can only be removed mechanically.