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ROOFBOND BCS PRIME 501 is a high-performance, single-component acrylate penetrative water barrier primer based on acrylic co-polymers, flame retardants, blocking sealers and graded filler surfactants in aqueous dispersion. With ambient crosslinking technology, it consolidates and standardises surface absorption on concrete, masonry, cement, lime, gypsum, plaster boards and screeds — while reducing chemical ingress by 96% and maintaining breathability. Applied by brush or spray at 4–5 sq.m per litre. For industrial floorings, roads and waterproofing systems; can be mixed with cement for GEO fabric and fibre mesh applications.
Figures are controlled laboratory results. Actual site performance varies with substrate, temperature, humidity, application method and workmanship — please confirm the current product datasheet before specification.
ROOFBOND BCS PRIME 501 is a penetrative waterproofing primer, a single-component acrylate water barrier coat based on acrylic co-polymers in aqueous dispersion. It consolidates and standardises surface absorption on concrete, masonry, plaster boards and screeds while staying breathable. Use it as the primer before waterproofing coating systems, diluted with up to 20% water and applied by brush or spray.
Consolidates the surface and evens out absorption before coating.
Standardises absorption so later coats bond more effectively.
Applied by brush or spray at 4–5 sq.m per litre.
Used as a penetrative primer on cleaned road surfaces.
Reduces chemical ingress by 96% while staying breathable.
Undercoat for plaster, paints and waterproof coating systems.
Mixed with cement and water, covering 3–4 sq.m per litre.
Re-coatable after 3–4 hours, ready for the next coat.
To seal porous concrete before coating, apply at 4–5 sq.m per litre by brush or spray, depending on porosity. Adhesion to the surface is above 1.5 N/mm², water absorption is nil at 1 day and chemical ingress falls by 96%. As a breathable concrete primer it transmits 30 gm/m²/24 hr of water vapour. It is touch dry in 2 hours at 25°C and comes in 1, 5 and 20 Ltrs packs. Dilute with up to 20% water and stir for 3–5 minutes before use.
Armstrong Chemicals supplies ROOFBOND BCS PRIME 501 to sites across Telangana, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu, including Hyderabad, Vijayawada, Bengaluru, Kochi and Chennai.
Ambient crosslinking technology and blocking sealers let it go into the surface and consolidate it, instead of only coating the top.
Water absorption is nil at 1 day, yet it passes 30 gm/m²/24 hr of water vapour, so the surface stays breathable.
Adhesion above 1.5 N/mm² gives plaster, waterproof coatings, tile adhesives and paints a sound surface to bond to.
A penetrative acrylic co-polymer primer that uses ambient crosslinking technology to consolidate and seal concrete, masonry and screeds from within — reducing chemical ingress by 96%, maintaining water vapour breathability at 30 gm/m²/24hr, and delivering >1.5 N/mm² adhesion for subsequent waterproof coatings, plasters and tile adhesives.
Get a QuoteStandard surface primers coat the substrate without penetrating — leaving the underlying pore structure open to chemical attack, moisture and laitance. In roads, industrial floorings and chemical plant environments, this leads to rapid delamination and re-treatment cycles.
A penetrative primer that crosslinks inside the substrate — consolidating and standardising surface absorption, reducing chemical ingress by 96% and achieving NIL water absorption at 1 day, while remaining breathable at 30 gm/m²/24hr.
96% reduction in chemical ingress is the specific technical figure from this brochure — not a general "chemical resistant" claim. Combined with NIL water absorption at 1 day and <1% at 7 days, ROOFBOND BCS PRIME 501 provides a genuine barrier, not just improved adhesion.
At 67% ± 2 solid content — significantly higher than typical acrylic primers — ROOFBOND BCS PRIME 501 deposits more solid material per application, consolidating the substrate and delivering a denser, more durable barrier film than lower-solids primers.
Recommended for damaged road and highway surfaces where surface consolidation before repair or overlay is required.
Chemical resistance and surface standardisation for industrial flooring environments with chemical spillage and mechanical load exposure.
Consolidates and standardises substrate absorption before applying waterproof coatings, tile adhesives, plasters and skim coats.
96% chemical ingress reduction through ambient crosslinking — not just a surface coat.
Penetrative crosslinking reduces chemical ingress by 96% with NIL water absorption at 1 day and <1% at 7 days — a quantified barrier performance figure unique among Armstrong primers.
Water vapour transmission of 30 gm/m²/24hr ensures moisture can escape from the substrate — preventing blistering and delamination while blocking liquid water and chemical ingress.
67% ± 2 solid content deposits significantly more material into the substrate per application than standard acrylic primers — consolidating treated surfaces and standardising absorption for subsequent coatings.
Applicable from 5°C to 50°C — the widest temperature range of any Armstrong primer, enabling application in cold weather, high-temperature industrial environments and tropical outdoor conditions.
Ensure all surfaces are dry, sound and free from contamination — oil, grease, moss, algae, laitance, mould release oils, curing compounds and loose/decayed matter
Clean by grit blasting, wire brushing and water jet cleaning — choose the method appropriate to the surface condition
Where moss, algae or similar growth has occurred, treat with a biocide before cleaning
For applications over existing base coatings, primers, GEO fabric or fibre mesh: clean dust with an air blower after the relative dry period of each coating or system
Shake the ROOFBOND BCS PRIME 501 container before use
Dilute with up to 20% water; stir well with slow-speed stirrer or paddle machine for 3–5 minutes
Optional cement mix (for GEO fabric/fibre mesh): mix 1 litre of ROOFBOND BCS PRIME 501 + 20% water + 1 kg cement — apply as a penetrative coating; coverage becomes 3–4 sq.m per litre
Apply over the cleaned surface by brush or spray
Standard coverage: 4–5 sq.m per litre (porosity dependent)
Re-coatable after 3–4 hours
Available in 1, 5 & 20 Litre packs. Shelf life of 2 years from manufacture. Store in dry condition in original containers.
Skin contact: wash with soap and water. Eye contact: splash immediately with plenty of water; consult physician if irritation persists.
For GEO fabric or fibre mesh applications: mix 1 litre of ROOFBOND BCS PRIME 501 with 20% water and 1 kg cement. Apply as a penetrative coating at 3–4 sq.m per litre. Surfaces must be cleaned to a dry condition before applying the cement mix system.
Full specifications, application systems, layering guides, and coverage tables.
Request a quote and your nearest Armstrong distributor will contact you directly.
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