Sikalastic® Rapid 724 WG

Two-component polymethyl methacrylate (PMMA) liquid resin

Up to 12 months in the original unopened pail when properly stored, sealed and unmixed.

Store in a tightly closed container in a cool, dry, ventilated area away from heat and oxidizing agent. Do not store in direct sunlight or in temperatures below 55°F (13°C) or above 80°F (27°C). Keep away from open fire, flame or any ignition source.

5 g/L

Mixing ratio catalyst quantity is dependent on the ambient temperature.

37°F to 68°F  (3°C to 20°C)

23°F to 68°F  (-5°C to 20°C)

23°F to 68°F  (-5°C to 20°C)

15 to 20 minutes

All working and cure times are approximate and may vary upon wind, humidity and ambient/surface temperatures

5 hours

All working and cure times are approximate and may vary upon wind, humidity and ambient/surface temperatures

1 to 2 hours

All working and cure times are approximate and may vary upon wind, humidity and ambient/surface temperatures

                                           APPROXIMATE COVERAGE RATES

All values are nominal. Coverage rates may vary depending on substrate conditions and the application technique. Wet and dry thicknesses are always equivalent.

1. All surfaces should be clean, dry, free of dirt, dust, debris, loose particles, loose paint, rust and other contaminants.
2. If the membrane is old or extremely soiled, use Sika approved cleaner to restore the membrane to a `like new’ condition before applying Sikalastic® Rapid 724 WG.
3. Clean and prepare metal surfaces to near white metal in accordance with SSPC-SP3 (power tool clean). If power tools are not available, use abrasive paper with a grain size of 20 to 40 to remove all loose particles including paint flakes and rust.
4. Grind concrete and masonry surfaces with diamond cup wheel to remove laitance and contaminants.
5. Lightly sand rigid PVC and plastic surfaces. Extend surface preparation a minimum of 1/8" (3 mm) beyond the termination of the flashing.
6. Wipe metal surfaces with Sika approved cleaner and allow to dry.
7. For repairs or touch-up, wipe previously installed Liquid Flashing with Sika approved cleaner to clean and reactivate the Liquid Flashing and allow to dry.
8. Prime wood and concrete surfaces with Sikalastic Rapid Primer. Allow Sikalastic Rapid Primer to dry to the touch before applying Sikalastic® Rapid 724 WG.
9. If a gap of more than 1/4" (6.3 mm) exists between edge of horizontal membrane surface and vertical transition surface, the gap must be filled with Sikaflex®‐1a.

1. Pre-cut Sikalastic Rapid Fleece to fit around the penetration. Vertical flashing pieces must extend 2" (51 mm) from the base onto the horizontal and horizontal flashing pieces must extend 8" (20.3 cm) out from the base of any penetration. Flashing height should be a minimum of 8" (20.3 cm). Horizontal Sikalastic Rapid fleece pieces must extend a minimum of 8" (20.3 cm) beyond the leading edge of the penetration, or a minimum of 4" (10.2 cm) beyond the edge of the fastening plate. Add 2" (51 mm) for the overlap with adjoining pieces.
2. Once the edges of the fleece are determined, mark a line on the membrane 1/2" (13 mm) beyond the edge of the fleece and apply painter’s tape. This will accommodate the 1/2" (13 mm) of non-reinforced Sikalastic® Rapid 724 WG needed to terminate to the membrane.
3. With the tape in place, clean the membrane within the area using Sika approved cleaner including the plates and the penetration.
4. Thoroughly stir the entire container of Sikalastic® Rapid 724 WG with a slow-speed (200 to 400 rpm) mechanical mixer (electric drill with a mixing blade) for two minutes.
5. Pour 1 liter of Sikalastic® Rapid 724 WG into a clean plastic container. Add Sikalastic Rapid Catalyst to Sikalastic® Rapid 724 WG at rates depending on ambient temperature (see Mixing Rates table). Mix using a slow-speed mechanical mixer with a separate mixing paddle for two minutes. Once mixed, the pot life is approximately 10 - 15 minutes depending on the ambient temperature.
6. Using a small ½" (13 mm) nap roller with rounded edges or 2" (51 mm) disposable paint brush apply catalyzed Sikalastic® Rapid 724 WG at the required consumption onto the penetration up to the finished flashing height and 2" (51 mm) onto the roof membrane.
7. Embed the pre-cut vertical Sikalastic Rapid Fleece into the wet Sikalastic® Rapid 724 WG. Use the roller or brush to eliminate wrinkles and air bubbles while completely saturating the Sikalastic Rapid Fleece. Apply additional catalyzed Sikalastic® Rapid 724 WG at the 2" (51 mm) overlap between the vertical Sikalastic Rapid Fleece layers.
8. Apply catalyzed Sikalastic® Rapid 724 WG at the required consumption onto the roof membrane extending slightly onto the painter's tape. Also coat the 2" (51 mm) fingers from the vertical Sikalastic Rapid Fleece.
9. Embed the pre-cut horizontal Sikalastic Rapid Fleece into the wet Sikalastic® Rapid 724 WG. Use the roller or brush to eliminate wrinkles and air bubbles while completely saturating the Sikalastic Rapid Fleece. Apply additional catalyzed Sikalastic® Rapid 724 WG at the 2" (51 mm) overlap between the horizontal Sikalastic Rapid Fleece layers.
10. Apply catalyzed Sikalastic® Rapid 724 WG over the entire exposed vertical and horizontal Sikalastic Rapid Fleece terminating at the finished flashing height on the vertical and onto the painter's tape on the roof. Make sure the fleece is fully saturated without any dry spots.
11. Remove the painter's tape immediately after applying the final layer of catalyzed Sikalastic® Rapid 724 WG.

Note:
Complex and/or irregular shapes including nuts, bolts, etc. may require an additional layer of catalyzed Sikalastic® Rapid 724 WG to ensure full coverage. Wait one hour before applications. For repairs or touch-up, wipe cured Sikalastic® Rapid 724 WG with Sika approved cleaner to clean and allow to dry.