Sika Concrete Primer Lo-VOC
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Sika Concrete Primer Lo-VOC is cold applied, single component, moisture-curing polyurethane resin. It is designed for sealing cementious substrates to reduce the incidence of outgassing and enhance adhestion of Sikalastic RoofPro and Sikalastic RoofCoat systems.
- Significantly reduces the likelihood of blistering and pin holing
- Fast curing formulation
- Single component
- Compatible with most concrete, masonry, stone, roof cover boards and plywood substrates
- Lo-VOC
Usage
- For use on most sound substrate surfaces where both a penetrative and surface-lying effect is required
- For use as reactivation primer prior to repairing, modifiying or overcoating Sikalastic©-641 Lo-VOC, Sikalastic©-644 Lo-VOC and Sikalastic©-646 Lo-VOC when overcoat window is exceeded
Advantages
- Significantly reduces the likelihood of blistering and pin holing
- Fast curing formulation
- Single component
- Compatible with most concrete, masonry, stone, roof cover boards and plywood substrates
- Lo-VOC
Packaging
5 gal. (19 L) pails
Product Details
Chemical Base
Moisture-cure polyurethane
Shelf Life
12 months
Storage Conditions
Store dry between 41 °F and 77 °F (5–25 °C). Condition material to 50–77 °F (10–25 °C) before using for ease of application
Density
9.8 lbs/gal | (ASTM D-1475) |
Solid content by mass
64% by weight | (ASTM D-1644 Method A) |
Volatile organic compound (VOC) content
96 g/l | (ASTM D-2369-81) |
Application
Ambient Air Temperature
41 °F (5 °C) min. / 95 °F (35 °C) max.
Relative Air Humidity
80 % R.H. max.
Dew Point
Not for use on surfaces with condensation.
Air, 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.
Substrate Moisture Content
≤ 4 % moisture content Test method: Sika®-Tramex meter
No rising moisture according to ASTM (Polyethylene-sheet).
Pot Life
45 minutes
Waiting / Recoat Times
30–45 minutes at 77 °F (25 °C) and 50 % R.H.. Lower temperatures will extend cure time.
Membrane resin should be applied within 24 hours of primer application. Maximum primer exposure is 72 hours. Primer exposed longer than 72 hours, primer exposed to water during curing and exhibiting a chalky appearance, must be re-primed. Deteriorated primer must be
mechanically removed before primer reapplication
Coverage
350 ft2/gal. on non-absorbent smooth substrates.
300 ft2/gal. on prepared, dry concrete.
200 ft2/gal. on absorbent gypsum and cementitious cover boards.
Note: Rough, porous, or absorbent surfaces will require additional primer and
will reduce yield.
SUBSTRATE PREPARATION
Surface must be clean, sound and dry. Remove dust,laitance, grease, curing compounds, bond inhibiting impregnations, waxes and any other contaminants. All projections, rough spots, etc. should be dressed off to achieve a level surface prior to the application.
Concrete - Should be cleaned and prepared to achieve a laitance and contaminant-free, open textured surface by blast cleaning or equivalent mechanical means (CSP-3 per ICRI guidelines). Sweep and vacuum any remaining dirt and dust with a wet/dry vacuum. Removing residual dust will help ensure a tenacious bond between the primer and substrate.
Plywood - Should be clean and smooth, APA and exterior grade, not less than 1/2” thick, and spaced and supported according to APA guidelines. Joints should be sealed with Sikaflex® 2c or 1a and detailed, and may need embedded fabric reinforcement. Maximum moisture content 4%.
Existing Coatings - Should be cleaned and mechanically abraded to provide a contaminant free, open textured surface. Followed by a solvent wipe or mop as allowed by state and local regulations. After solvent flashes off proceed with Sikalastic® Primer application.
MIXING
No mixing necessary.
APPLICATION
Apply by medium nap phenolic core roller or squeegee and backroll ensuring an even and consistent coverage. Ensure all excess material is removed by back rolling with no pooling or puddling of resin. Allow coating to cure ~45 minutes or until tackfree before proceeding with subsequent system. Primer must be overcoated within 72 hours, if this window is missed the primer must be abraded and solvent wiped followed by an additional coat of Primer before proceeding.
Removal
Remove liquid uncured resin immediately with dry cloth and do solvent cleanup. Once cured, resin can only be removed by mechanical means.
CLEANING OF TOOLS
Clean all tools and application equipment with appropriate solvent immediately after use. Hardened and/or cured material can only be removed mechanically