BestPrimer PU50S

• BestPrimer PU50S is used as an interfacial primer between substrates such as concrete, mortar, stone, etc., and protective or waterproofing coatings from the BestCoat and BestSeal ranges (epoxy, polyurethane, or polyurea), in order to enhance adhesion strength between layers.

• BestPrimer PU50S can be applied on concrete floors, cementitious renders, fiber cement boards, epoxy mortars, etc., in areas such as factories, warehouses, garages, parking areas, rooftops, gutters, terraces, and similar applications.

• High penetration capability allows deep bonding into the substrate.
  Excellent adhesion to all types of substrates, including metal surfaces.
  Enhances aesthetics and significantly reduces consumption of subsequent coating layers.
  High resistance to alkali and aggressive chemical attack.
  Easy application using common tools such as brushes, rollers, and spray equipment.
  Long pot life facilitates easy application and minimizes material waste.
  Low material consumption ensures high cost-efficiency.

• Ready to use, no further preparation needed.

SURFACE PREPARATION

• The substrate must meet the minimum strength requirements (compressive strength ≥ 20 MPa, tensile strength ≥ 1.5 MPa).

• The surface must be level, sound, and dry (maximum moisture content of 4%). All contaminants, debris, and dust must be properly removed.

APPLICATION PROCEDURE

Coating system:

• For highly absorbent or weak substrates, apply at least 2 coats of primer.

• For smooth, dense substrates with moderate roughness, apply 1 coat of BestPrimer PU40S after proper surface preparation.

• For surfaces treated with hardeners, dilute BestPrimer PU40S with 5–10% BestThinner SC01 before application.

Application:

• Apply BestPrimer PU40S evenly over the entire surface using a brush, roller, or airless spray equipment.

Notes:

• Apply only the required amount according to the substrate’s absorption capacity; do not over-apply or allow ponding on the surface.

• Ensure proper ventilation during application and work in the direction of airflow. Do not smoke and keep away from heat sources and sparks during application.

CLEANING

• Use BestClean SC003 to clean tools immediately after use and before BestPrimer PU40S begins to cure.

SAFETY INSTRUCTIONS

• The product is classified as hazardous and flammable. Keep away from heat sources, sparks, and open flames during application and storage.

• The product may cause irritation to sensitive skin upon prolonged contact. Wear protective gloves, masks, and safety goggles during application.

• In case of contact with eyes, nose, mouth, etc., rinse immediately with plenty of clean water and seek medical attention at the nearest healthcare facility.

• Dispose of excess material in accordance with local regulations.