Starpatch Supa-Fine Patching Mortar is a single-component, polymer-modified concrete repair compound engineered for versatile construction and renovation applications. This premixed blend of Portland cement and graded silica aggregates delivers high strength with a smooth finish, suitable for horizontal, vertical, and overhead surfaces. Apply from feathered edges up to 5/8" thickness for multi-purpose patching, restoration, and topping work. Formulated without gypsum, chlorides, ferrous metals, or corrosive agents, it provides reliable performance on both interior and exterior projects. For wearing surfaces, apply a protective sealer or coating to maximize durability. Recommended For: Horizontal, vertical & overhead applications Do not add more water once Supa - Fine has started setting up. Add approximately 27-29% water by volume or about 5.4 liters of water per bag. For added strength and adhesion, you may substitute some of the water with 1 liter of 900X per bag. Be sure to put water in your mixing container first and then add the dry powder. Application: Apply Supa - Fine into the repair zone substrate by compacting the material well against the properly prepared substrate. Finish the surface with a steel or wood trowel, or sponge float. Repairs greater than 5/8” should be done in multiple lifts. Protect the repaired area from very hot direct sunlight. Compressive Strength: (CAN/CSA-A5, ASTM C109) 3 Days: 21 Mpa, 3000 Psi 7 Days: 25 Mpa, 3625 Psi 28 Days: 34 Mpa Recommended Applications: Warehouse & industrial repairs or overlays Areas exposed to heavy-duty loads Rained out or freeze damaged slabs Repairing wood and cement-board type underlayments Coverage: ⅛”: 45 sq. ft. ½”: 11 sq. ft. ¼”: 22 sq. ft. ⅝”: 9 sq. ft. ⅜”: 15 sq. ft. Advantages: Easy to apply & use. Just add water to the powder mix and stir. Superior bonding and adhesion properties. Will not sag or slip. Surface Preparation: Surfaces to be covered must be structurally sound, clean, and free of dust, oil, grease, sealers, curing compounds, laitance, release agents, or other surface contaminants. Where possible, cut vertical shoulders at edges to accommodate repair. For smooth surfaces, we recommend mechanical abrasion to achieve an acceptable surface profile. The cleaning and preparation method selected depends on both the sub-floor material and its condition. Acid etching is not recommended. Starpatch 900X bonding agent should be used on the substrate for optimal adhesion. Allow the bonding agent to become dry or tacky before applying Supa - Fine. Mixing Instructions: Using a mixing paddle (a whip type is recommended) with a low-speed drill (400 to 500 rpm), mix thoroughly (2 to 3 minutes) until the powder has been completely dispersed and the mix has acquired a smooth homogeneous consistency.
