Sikalastic®-320 SG

12 months from date of manufacture in original, factory-sealed containers

Store indoors at temperatures between 65–85 °F (18–30 °C)

See Product Safety Data Sheet

-25–200 °F (-31.7–93.3 °C)

Application on Green Concrete

Horizontal: 48 hours or walkable conditions
Vertical: 24 hours after forms removed

47 ft²/gal results in 30 ± mils DFT
23 ft²/gal results in 60 ± mils DFT (standard)
15 ft²/gal results in 90 ± mils DFT
11 ft²/gal results in 120 ± mils DFT

Surfaces may be dry or damp, but must be sound and free of standing water, dust, laitance, grease, curing compounds, impregnations, waxes and any other contaminants. Scratch and remove sheen for metal surfaces before applying primer. Scratch marine grade and high density plywood with sandpaper before applying primer.

Before application, Sikalastic®-320 SG should be thoroughly mixed using a mechanical mixer and jiffy style paddle at slow speed for 2 minutes minimum to ensure a homogeneous material. Take care not to allow entrapment of air into the material. Do not mix in an up and down motion.

Using Optional Water Catalyst (only for non-spray applications) : Before application, mix Sikalastic®-320 SG using a mechanical mixer and jiffy style mixing paddle at a slow speed. At a ratio 1 part of water to no less than 40 parts Sikalastic®-320 SG. For a 5 gal pail, add 1 pint (16 oz) of water (less water may be used to extend working time). Use care not to allow the entrapment of air into the mixture. Do not mix in an up and down motion. Once water is mixed with Sikalastic®-320 SG apply within 20 minutes. Do not mix Sikalastic®-320 SG with water when using an airless sprayer.

Sikalastic®-320 SG may applied with an airless sprayer. Apply up to 90 mils vertically and 120 mils horizontally per coat. Mix Sikalastic®-320 SG with water to greatly reduce the chance of pinhole formation from concrete out-gassing and improve cure rate. Cured membrane must be pinhole free after application to validate warranty. (Contact Sika Technical Services for Plaza Deck applications where vegetation is planned).

Priming: Some warranties and/or substrates may require the use of a primer. See “Sikalastic® 320 Warranty Guidelines”for more information. Use the following primers accordingly: Sikadur® 22 LM FS for concrete, PVC and marine-grade or high-density plywood; Sikaflex® Primer 449 for PVC; Sikalastic® Recoat Primer for Fiberglass; and Sikalastic® PF Lo-VOC Primer for all other surfaces including concrete, EIFS, DensGlass, metal, and marine grade or high density plywood.

Joints, Cracks and Flashing: For all cracks up to 1/16” width apply a 4” wide, 30 mil stripe coat of Sikalastic®-320 SG centered over the crack. All cracks over 1/16” width must be routed to at least ¼” by ¼” sealed with the appropriate Sikaflex® sealant and coated with a 4” wide, 30 mil stripe coat centered on the sealant. When sealing green concrete, use Sikaflex®1a. Sealant may be overcoated when tack free. Sika Flexitape Heavy reinforcing fabric may be required for metal flashing transitions, plywood seams, and expansion joints by embedding reinforcing in 15 mils of membrane then coating with another 15 mils of membrane.

Curing and Recoating: At 75 °F (24 °C) and 50 % relative humidity, allow each coat of Sikalastic®-320 SG to cure 16–24 hours* minimum. When using water as a catalyst: allow Sikalastic®-320 SG to cure a minimum of 2–4 hours* before proceeding to subsequent coats. If more than 48 hours pass between coats the surface must be solvent wiped and primed with Sikalastic Recoat Primer.

Spray Equipment: Use Sikalastic®-320 SG with a Graco GH 833 Big Rig or Titan Hydra Pro IV airless pump. Use a 1.5” Solvent-Resistant Siphon Kit, 1/2” High Pressure Hose (4000 psi), 1/4” x 3’ High Pressure Whip (4000 psi), Graco 535 Spray Tip, 15” Tip Extension Wand, and a Graco Flex Plus Gun. Contact Sika Technical Services for more information.

Membrane Protection: As soon as possible after completion of a successful water test, visual inspection and/or repairs, cover membrane with an approved drainage mat or protection board. Sikalastic®-320 SG should not be exposed to sunlight or UV radiation for more than 14 days.

Flood Test: After Sikalastic®-320 SG has cured, plug drains and provide proper means to contain flood water. Flood deck with a 2” head of water and allow to stand for 24 hours. Check for leaks and immediately make repairs if required. Retest after any repairs have been made. If a flood test cannot be completed in within 3 days of application, cover Sikalastic®-320 SG with a protection course to prevent damage from other trade work until a successful flood test is completed.

Equipment should be immediately cleaned with an environmentally safe solvent, as permitted under local regulations.