Sikalastic® MT Primer

24 months in original unopened container under proper storage conditions

Store dry between 40–90 °F (4–32 °C).

Precondition material for at least 24 hours between 65–75 °F (18–24 °C).

822 (SP2/100) Components A + B

Before applying second coat of Sikalastic® MT Primer allow:

Before applying Sikalastic® 710, 720, or 390 on Sikalastic® MT Primer allow:

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-3-4 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.

Metal - Should be thoroughly cleaned by solvent wiping, then grinding or blast cleaning to near white metal (SSPC SPC-3).

Premix Part A and Part B components separately using a low speed (400-600 rpm) mechanical mixer and Jiffy Paddle at slow speed to obtain uniform color (typically 30 seconds), making sure to scrape the solids from the bottom and sides of the pail. Pour Part B into Part A slowly and while mixing scrape the side of the container, Mix the combined material thoroughly until a homogenous mixture and uniform color is obtained (typically 3 minutes). Use care not to allow the entrapment of air into the mixture. Do not mix more material than can be applied within the working time limits (i.e. Pot Life) at the actual field temperature.

Concrete - Apply primer by 1/8” squeegee at the rate of 160–200 ft² / US gal (3.4–4.9 m² /L) at 8–10 mils (0.20–0.25 mm) wet film thickness and back roll with a phenolic resin core roller with pressure after 20 minutes. Coverage will vary depending on the porosity of the prepared substrate. Apply a second primer coat by squeegee at the rate of 160–200 ft² / US gal (3.4–4.9 m² / L) at 8–10 mils (0.20–0.25 mm) wet film thickness and back roll with pressure after 20 minutes after the first primer coat is tack free, which is typically after 12 hours at 68 °F (20 °C). Do not apply by dipping roller into mixing container. Pour a bead of product in the form of a ribbon on the substrate to be coated and then spread with squeegee and back roll. Ensure that the second coating is pore-free and pinhole-free and provides uniform and complete coverage over the entire concrete substrate.

Plywood - Apply primer by 1/8” squeegee at the rate of 160–200 ft² / US gal (3.4–4.9 m² /L) at 8–10 mils (0.20–0.25 mm) wet film thickness and back roll with a phenolic resin core roller. Coverage will vary depending on the porosity of the prepared substrate. Do not apply by dipping roller into mixing container. Pour a bead of product in the form of a ribbon on the substrate to be coated and then spread with squeegee and back roll.

Metal - Apply primer by brush or phenolic resin core roller at the rate of 225–275 ft² / US gal (5.5–6.7 m² /L) at 6–7 mils (0.15–0.18 mm) wet film thickness.

Aggregate –Aggregate is not required for traffic coating applications if Sikalastic® MT Primer is recoated within the maximum recoat window. When an extended application window is desired, or when using Sikalastic® MT Primer in conjunction with SikaLevel underlayments and patching mortars, oven dried silica sand (20/30) shall be broadcast to refusal at a typical rate of 2 lbs/sf into a second coat of Sikalastic® MT Primer immediately upon primer application. Remove excess sand following cure prior to underlayment/patching mortar application.