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ReadSealants & Crack Fillers
Polymer modified crack filling compound in powder form that is mixed with water to fill hairline and fine cracks in concrete and masonry.
Polymer modified Fine Crack Filling compound in powder form. High performance cementitious crack sealer for fine cracks in concrete and masonry. Mix with water to fill hairline and fine cracks. Provides durable, flexible seal with good adhesion.
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.
RAPIDSTRONG CRACK SEALER 85 is a hairline crack filler, a polymer modified cementitious compound in powder form for fine cracks in concrete and masonry. You mix it with clean water to a smooth paste and force it into the crack with a putty knife or trowel. It works as a plaster crack filler too.
Widen the crack slightly so the paste gets in fully.
Paste is forced in with a putty knife or trowel.
Gives a durable, flexible seal with good adhesion to masonry.
Fill the crack completely, leaving no air voids.
Fill fine cracks first, then let the filler cure.
Sand smooth after curing before applying a top coat.
For hairline cracks in wall or ceiling surfaces, clean out dust and loose material first. The polymer modified paste gives a durable, flexible seal. Used as a wall crack filler before painting, it can be sanded smooth after curing. Do not let it dry out rapidly in hot conditions.
Armstrong Chemicals supplies RAPIDSTRONG CRACK SEALER 85 to sites across Telangana, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu, including Hyderabad, Vijayawada, Bengaluru, Kochi and Chennai.
Polymer modification gives the cured filler flexibility, so you get a durable, flexible seal in the crack.
It is designed for fine to hairline cracks in concrete and masonry, where a smooth paste can be forced in.
Good adhesion to concrete and masonry helps the filled crack stay sealed under a top coat or paint.
Clean the crack — remove dust, loose material, and any contamination
Widen hairline cracks slightly with a crack chaser or grinder for better penetration
Mix RAPIDSTRONG CRACK SEALER 85 powder with clean water to a smooth paste
Force the paste into the crack using a putty knife or trowel
Ensure crack is fully filled with no air voids
Allow to cure — do not allow to dry out rapidly in hot conditions
Sand smooth after curing if required before applying top coat
Coverage estimation is not applicable for this product. Please contact our team for application guidance.
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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