Everbuild Concrete Hardener & Dustproofer 5 Litre 403 Everbuild Concrete Hardener & Dustproofer is a concentrated silicate solution for direct application to concrete. Hardens & dustproofs the surface.BENEFITS- Internal & external use- Fast acting- Leaves a residual surface to prevent further dusting- Helps prevent bloom/efflorescence AREAS FOR USEAs a dustproofer for new & old concrete/cement based floors, screeds & paving in factories, garages & domestic dwellings