• BestSeal PU450 is a one-component waterproofing membrane that is highly elastic, and cold-applied.
  
• It based on polyurethane resin which cures to create a waterproofing membrane with excellent abrasion, mechanical, chemical, thermal, and UV resistance. 
  

BestSeal PU450 is used to waterproof construction building parts such as:

• Terrace, roof deck, seno, balcony, toilet floor...
  
• Swimming pool, water tank, bridge deck, water supply, and drainage pipes....
  
• Basement, walls, basement walls, underground concrete structures...
  
• Sealing concrete cracks, joints, and brick joints.
  

• One component has no limited working time, easy to use, economical, and has no wasted materials.
  
• High bonding strength for most types of materials such as concrete, fired brick, mortar, plaster, fibro-cement, glass, tile, metal...
  
• High elasticity, and it performs waterproofing ability even when the concrete structure appears tiny cracks when expanding due to temperature changes.
  
• Good alkali resistance, water resistance, and weather resistance, especially for ultraviolet rays.
  
• Easy to apply with available tools such as roller, brush, nozzle...
  
• Non-flammable, odorless, and non-toxic to workers and the environment.
  

Surface preparation:

• The surface must be clean, and dry. There is no dirt, grease, moss, or mold.
  
• All of weak adhesive layers or coating and old waterproofing coats must be removed by appropriate methods. 

Application: 

• As a primer: Diluting BestSeal PU450 with 30-45% water then sweep onto the pre-surface as above. For more professional applications, apply primers of BestBond AC301 (when directly coated on glass or ceramic.) at the consumption of 0.25 ÷ 0.35 kg/m2
  
• As a topcoat: Use a brush, roller, or spray pressure machine to apply BestSeal PU450 to entire the prepared surface with consumption of 0.5÷0.6kg /m2/layer, (depending on waterproof performance was requested). Apply at least 2 layers.
  
• The second layer is applied in a diagonal or perpendicular direction to the previous layer, to limit the air bubble in the system and distribution materials entire surface with a uniform thickness.
  
• For high requirements of waterproof ability, could apply 3 layers.
  

Note:

• Mixing well before using.
  
• Applies at least 2 layers of the product. The second layer must be completed within 12-48 hours after finished the previous coating.
  
• Do not apply in rainy conditions. In case it rains during construction, the construction work should be stopped immediately and promptly cover the construction area from being directly affected by rainwater.
  
• For the surface area that frequently has mechanical impact or UV (ultraviolet) rays during use, it is recommended to apply a layer of cement- sand mortar mixed with BestLatex R114, BestLatex R126, or BestSeal B12 with cement (after applying the final layer for 72 hours) to protect damage structure for the BestSeal PU450 coat.
  
• BestSeal PU450 is self-curing and does not require water to moisten the surface after application.
  

Cleaning: 

• Clean tools and equipment with clean water after work and before the mixture hardens.
  

Safety:

• The product can cause an allergic reaction to sensitive skin with long contact. Should wear gloves, and mask, and glasses while applying the product.
  
• In case of contact with the eyes, nose, and mouth ... should be washed with clean water several times before going to the nearest medical facility for timely and correct
  adjustment.