Sikalastic®-720 One Shot

• Meets ASTM C957 "Standard Specification for High-Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane with Integral Wearing Surface".

1 year in original, unopened containers.

Store dry at 41-95 °F (5-35 °C).

Condition material to 65-85 °F (18-30 °C) before using.

See Product Safety Data Sheet

95% including aggregate

45 mils dry (48 WFT)

33 sf/gal

158 sf/Pail (4.8 gal A+B+Aggregate mix)

Surface must be clean, dry, and sound with an open texture. Remove dust, laitance, grease, curing compounds, bond inhibiting impregnations, waxes, and any other contaminants. All projections, rough spots, etc., must be removed to achieve a level surface prior to the application.

Concrete - Must be cleaned and prepared to achieve a laitance and contaminant-free, open-textured surface by blast cleaning or equivalent mechanical means. The desired surface texture is CSP 3 per ICRI Guidelines. In addition, the substrate surface must be thoroughly cleaned by blowing/vacuuming to remove all particulates that may interfere with coat bonding.

Plywood – Must be clean and smooth, APA and exterior grade, not less than ½” thick, and spaced and supported according to APA guidelines. Joints should be sealed with Sikaflex® 2c NS EZ Mix or Sikaflex® 1a and detailed, may need embedded fabric reinforcement.

Metal - Metal must be in sound condition. The surface should be free of all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, corrosion products and other foreign matter. Be aware of dew point and check it before every application on metal surface.

• Ferrous Metals: Must be prepared to SSPC-SP6/NACE 3. For areas where SSPC-SP6/NACE 3 is prohibited or not feasible, substrate can be thoroughly cleaned by grinding or other power tools per SSPC-SP11.
• Non-Ferrous Metals: Prepare to a bright metal surface. Wire brushing can be used for soft metal such as copper or lead.
• Galvanized Steel: White rust must be removed from galvanized steel, with care taken not to damage or remove the galvanizing.
• Stainless Steel: Must be mechanically abraded or ground to create an appropriate anchor profile.

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 approved primer for existing coating.

DETAILING

For cracks less than 1/16” width: Apply a 23 mil detail coat of a Sikalastic® Base Coat, extending 2” on either side and centered over the crack.

For cracks 1/16” width or greater and less than 1” width: Must be routed to at least ¼” by ¼”, and sealed with an appropriate Sikaflex® sealant, installed per sealant Product Data Sheet, and coated with a 23 mil detail coat of a Sikalastic® Base Coat, extending 2” on either side and centered over the crack. Non-moving cracks can be filled with compatible rigid repair materials.

NOTE: Cracks may indicate a structural issue and should be addressed by a structural engineer or appropriate design professional. For joints 1/16” or greater and up to 1” width: Joints should be sealed with the appropriate Sikaflex® sealant, installed per sealant Product Data Sheet, and coated with a 23 mil detail coat of a Sikalastic® Base Coat, extending 2” on either side and centered over the crack.

For joints greater than 1” width: Should be treated as expansion joints and brought up through the system and/or use Emseal Expansion Joint. For additional questions please contact Sika Technical Services.

Fabric Reinforcement: An optional 3” or 6” wide Sikalastic Flexitape Heavy fabric strip may be embedded within the base coat. Flexitape width shall be chosen such that a minimum of 1” tape is embedded on either side of the crack/joint. Apply additional coating as required to fully embed the Flexitape in the coating.

Panelized Joints: Panelized joints that are restrained across the joint and without differential movement may be sealed and the deck coating, including detail coat, applied over the joint.

 
NOTE: movement within panelized joints may cause deterioration of the aggregated wear coat, in which case the joints should be treated as expansion joints and brought up through the Sikalastic Traffic System and sealed with Sikaflex® sealant. For additional questions please contact Sika Technical Services

PRIMING

  
Primer Selection - Primer is required for all applications of Sikalastic®-720 One Shot.  For applications over concrete, the primer used will depend on the moisture level of the concrete.  Measure the moisture content of concrete substrate with a Tramex CME or CMExpert type concrete moisture meter.

Sikadur®-22 Lo-Mod FS- For concrete with a maximum moisture content of 4 % by weight, plywood decks, and existing polyurethane coatings, apply a single coat application of Sikadur®-22 Lo-Mod FS with a flat squeegee or roller at approximately 10 mils at 160 sf/gal.  Apply evenly without puddling. Allow primer to cure until tack-free, typically 2-4 hours (at 75°F (24°C) 50 % R. H). Sikadur®-22 Lo-Mod FS should be overcoated within 36 hours after tack-free.  Refer to a separate product data sheet for additional information.

  
Sikalastic® FTP LoVOC Primer - For plywood decks, concrete with a maximum moisture content of 5 % by weight, apply a single coat application of Sikalastic® FTP LoVOC Primer with a flat squeegee or roller at approximately 175 sf/gal. For concrete decks with a maximum moisture content of 6% by weight, apply two applications of Sikalastic® FTP LoVOC Primer with a flat squeegee or phenolic resin roller at approximately 175 - 220 sf/gal per application. Work primer well into the substrate to ensure adequate penetration and sealing.  Apply evenly without puddling. Refer to separate primer data sheet for additional information.

Sikalastic® 100 VB - For concrete with a maximum moisture content of 5 % by weight, apply Sikalastic® 100 VB with a flat squeegee or roller at approximately 160 sf/gal to achieve 10 mils. For concrete decks with a maximum moisture content of 6% by weight or applications, apply two applications of Sikalastic® 100 VB with a flat squeegee or phenolic resin roller at approximately 160 sf/gal to achieve 10 mils per application. Work primer well into the substrate to ensure adequate penetration and sealing and puddles are avoided, for applications as a moisture barrier and additonal infomation refer to separate primer data sheet.

Sikalastic® EP Primer/Sealer- For Wood (timber, plywood) and Metal (aluminum, galvanized, cast iron, copper, lead, brass, stainless steel, steel, zinc). Apply by brush or phenolic resin core roller at the recommended rate,100-250 sf/gal depending on the substrate. Correct amount of primer will saturate the substrate and leave a slight film on the substrate top surface.  Apply evenly without puddling. Refer to separate primer data sheet for additional information.

Sikadur®-22 Lo-Mod LT- For cold weather applications on concrete with a maximum moisture content of 4 % by weight and existing polyurethane coatings, apply a single coat application of Sikadur®-22 Lo-Mod LT with a flat squeegee or roller at approximately 160 sf/gal. Apply evenly without puddling. Allow primer to cure until tack-free, typically 2-4 hours (at 50°F (10°C) 50 % R. H). Sikadur®-22 Lo-Mod LT should be overcoated within 36 hours after tack-free.  Refer to a separate product data sheet for additional information.

Sikadur®-57 Lo-Mod LV- For concrete with a maximum moisture content of 4 % by weight, apply a single coat application of Sikadur®-57 Lo-Mod LV with a flat squeegee or roller at approximately 125-150 sf/gal. Apply evenly without puddling. Refer to a separate product data sheet for additional information.

   
Sikalastic® Primer – For existing polyurethane coatings only, apply Sikalastic® Primer with a flat squeegee or phenolic resin core roller at approximately 300 sf/gal. Work primer well into the substrate to ensure adequate penetration and sealing.  Apply evenly without puddling. Sikalastic® Primer is not suitable for metal substrates. Refer to a separate primer data sheet for additional information.

After opening Part A, place lid face up on ground, remove aggregate insert and place insert on pail lid. Premix Part A component using a low speed (400–600 rpm) mechanical mixer and Jiffy Paddle (5-50 gal. model) at slow speed to obtain uniform color. Slowly add aggregate from tray into Part A and continue to mix, making sure to scrape the bottom and sides of the pail, ensure aggregate is fully mixed within the Part A . Slowly pour Part B into Part A while mixing so that the Part B gets pulled into the vortex of the mixing paddle.  Scrape the sides of the container, Mix the combined material thoroughly for 3 minutes until a homogenous mixture and uniform color is obtained.  Use care to prevent whipping air into the material while mixing - use a slow and methodical mixing approach.

After mixing, immediately pour the mixed Sikalastic®-720 One Shot onto the substrate. Leaving the Sikalastic®-720 One Shot in the pail will shorten the working time and pot life and will result in loss of material. Material should be poured out in a ribbon fashion and not in one large puddle. This will help make sure to get the most effective squeegee application. Apply Sikalastic®-720 One Shot over the entire area including previously detailed cracks. Coating should be tack free after about 6 hours at 70 °F and 50 % RH. Allow coating to cure for a minimum of 36 hours before opening to vehicular traffic.

Proper Squeegee: Use a 3/8" V-notched squeegee or trowel to achieve the proper wet film thickness of 48 WFT (45 DFT). The squeegee must be stiff enough not to bend when significant pressure is placed on it - this will result in improper thickness. It is highly recommended to check thickness with a wet film gauge as work progresses. Decks with heavy undulations may benefit from a smaller width squeegee. Sika also offers a recommended squeegee, listed below for Sikalastic®-720 One Shot, contact your local Sika rep for more information. (Seymour Midwest's Speed Squeegee HD 3/8" W x 1/4" D (30-45 mil)).

Squeegee Application and Finish Rolling: Push squeegee behind ribbon of material with consistent pressure on squeegee, do not pull squeegee towards applicator. All material applied should pass through the squeegee notches. After squeegeeing material to proper thickness, backroll with 3/8" nap phenolic resin core roller in two directions; one perpendicular to the other. Wet roller with excess material prior to backrolling, using a dry roller for backrolling will result in improper application thickness. Do not apply pressure with roller, do not push material with roller. If backrolled more than one time in each direction final texture could be inconsistent.

Clean tools with solvent that is acceptable to be used based on local regulations.  Xylene, Acetone and MEK, if accepted locally are effective for cleaning tools and equipment.