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Seal Concrete Floor MasterTop 333:  

MasterTop 333 - Dust arresting and hardening treatment


MasterTop 333 is a deep penetrating silicate solution for sealing and dust-proofing powdery or friable concrete and concrete block surfaces


  • Old concrete floors that are dusting. Powdery or friable concrete that is dusting due to inadequate curing and/or low cement content and concrete block work with friable surfaces. New concrete surfaces to seal against oil, grease and many chemical solutions
  • Dust arresting treatment - Binds the surface of old or new concrete to reduce dusting Prolongs the serviceable life of "problem" concrete floors before re-topping is required. 
  • Deep penetrating liquid hardener. 
  • Increased durability and resistance to abrasion - protects concrete surfaces by sealing and hardening concrete surfaces,  dense surface - Resists penetration of oil and grease. 
  • Protects concrete from the corrosive effects of smoke fumes, mild acids, salts and many other aggressive chemical solutions Economical - large areas can be dustproofed with an application Caution : Will etch glass Not suitable for clay, bricks or pavers.



Correct surface preparation is essential to ensure a successful application. Surfaces must be dry and absorbent, free from oil, grease, paint, curing compounds and other contaminants.

New concrete floors:

New concrete floors that require hardening, sealing or dust arresting treatment should be left until they are at least 28 days old then dilute. MasterTop 333 1:1 with clean potable water, and carefully apply by broom, mop, spray or squeegee until absorption ceases and all pores are filled. Do not allow MasterTop 333 to puddle. Liquid membrane curing compounds should NOT be used when using MasterTop 333, use alternative methods such as polythene film or water curing.

Old concrete floors, soft stone, concrete blocks:

After surface preparation, apply 3 coats, at 24 hour intervals. 1st coat diluted 1:3 with potable water 2nd coat diluted 1:2 with potable water 3rd coat diluted 1:1 with potable water The application of the first coat should continue until no more solution will penetrate the surface. Allow to dry for 24 hours. Repeat procedure for 2nd and 3rd coats. During application do not allow puddles to form or a significant surface build will occur. A glaze or sheen should not form on the surface. MasterTop 333 is formulated to penetrate, not form a surface coating. 24 hours after the completion of the 3rd coat, wash and broom any excess surface material away. NOTE: Surfaces treated with MasterTop 333 can exhibit a whitish, blotchy appearance. Where the treated surface has been allowed to become wet up to seven days after the final coat, it can become slippery. To overcome these surface conditions, neutralise by brooming a solution of 1 part hydrochloric acid diluted in 15 parts of water onto the floor. Hose down after 10 minutes and allow to dry. The above procedure is also necessary before considering overcoating with paints, renders etc. A small test area is recommended prior to application of any subsequent surface finish. Treated surfaces may be opened to traffic when the surface has dried completely and no tackiness remains, usually after 24 hours.


Coverage will vary greatly depending on the porosity and texture of the surface of the concrete and its age. Old concrete can take double the quantity of MasterTop 333 compared to new concrete, as will a very rough profile at the surface. As a guide: Concrete Finish Old/New Coverage Wood float Old 0.17 litre/m2 (6m2/litre) Wood float New 0.10 litre/m2 (10m2/litre) Steel float Old 0.12 litre/m2 (8m2/litre) Steel float New 0.08 litre/m2 (12m2/litre) PACKAGING MasterTop 333 is packed in 5 and 20 litres containers.


MasterTop 333 has a shelf life of 12 months. Store out of direct sunlight, clear of the ground on pallets protected from rainfall.


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