Reactive concrete acid stain that creates permanent, variegated Antique Brown colour in new and existing concrete. Ideal for decorative interior and exterior concrete floors, patios, pathways and architectural surfaces.
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Fortis Antique Brown Concrete Acid Stain is a reactive, penetrating stain designed to create permanent, variegated colour effects in new and existing concrete.
Unlike conventional coatings that form a film on the surface, Fortis Acid Stain penetrates the concrete and chemically reacts with minerals within the surface. This reaction produces natural variations in colour, tone and pattern that become part of the concrete itself.
Antique Brown creates rich brown, bronze and aged earth-tone effects suitable for decorative concrete where a warm, natural and mottled appearance is desired. Because the final colour is created by a chemical reaction, every concrete surface will produce slightly different results depending on its composition, age, finishing method and porosity.
Suitable for interior and exterior applications, Fortis Antique Brown Concrete Acid Stain can be used on residential and commercial floors, patios, pathways, entertaining areas and other decorative concrete surfaces.
Once the reaction is complete, the surface is neutralised and thoroughly cleaned before applying a suitable Fortis concrete sealer.
Always perform a test area before application to confirm the expected colour and reaction.
Water-Based Reactive Acid Stain
Construction Adhesives, Coatings & Waterproofing, Concrete Protection, Craft & Hobby, Shop Fit Out
Concrete must be a minimum of 14 days old before applying Fortis Concrete Acid Stain.
The surface must be clean, dry, porous and free from coatings, sealers, curing compounds, oil, grease, wax and other contaminants that may interfere with the reaction. Previously coated or sealed concrete must be stripped back to bare, porous concrete.
Always establish a test area before proceeding. Concrete composition, surface condition and dilution rate can influence the final colour. Where dilution is required, record the selected ratio so it can be repeated across the main area.
Apply Fortis Antique Brown Concrete Acid Stain using a suitable non-metallic sprayer. Wet the surface evenly, then work the stain using a suitable soft brush or broom where required. Maintain a wet edge to minimise overlap marks.
Allow the stain to react and dry for a minimum of 4 hours. Additional applications may be made where greater colour depth or variation is required.
Once the reaction is complete, thoroughly neutralise and clean the surface to remove residue. Allow the concrete to dry completely before applying a suitable Fortis concrete sealer.
For detailed instructions, refer to How to Apply Concrete Acid Stains and the current product TDS.
Suitable for porous, unsealed concrete surfaces including:
The concrete must be sufficiently porous to allow the acid stain to penetrate and react with the surface.
Remove dirt, grease, adhesives, coatings, sealers, wax and other contaminants before application. Tightly trowelled or burnished concrete may require mechanical preparation to open the surface.
Do not use hydrochloric or muriatic acid to prepare the concrete before acid staining.
Not suitable for sealed, coated or non-porous surfaces unless they are correctly prepared before application.
1L, 5L, 15L
How does Antique Brown Concrete Acid Stain work?
It penetrates concrete and chemically reacts with minerals in the surface, creating permanent variations in colour and tone.
What colour does Antique Brown produce?
It can produce rich brown, bronze and aged earth-tone effects. The final colour varies according to the concrete and application.
Will the colour look the same on every surface?
No. Concrete composition, age, porosity and finishing method influence the result. Always complete a test area first.
Can Antique Brown be used outdoors?
Yes. It is suitable for properly prepared interior and exterior concrete.
Can acid stain be applied over sealed concrete?
No. Coatings and sealers prevent proper penetration. Prepare the surface back to clean, porous concrete.
Does acid stain peel or flake?
The stain reacts within the concrete rather than forming a conventional surface coating, so the colour itself will not peel or flake.
Can I apply more than one application?
Yes. Additional applications can increase colour depth and variation.
Does stained concrete need sealing?
Yes. After neutralising, cleaning and drying, protect the surface with a suitable Fortis concrete sealer.
Where can I find application instructions?
Refer to the product TDS and How to Apply Concrete Acid Stains.
Acid Stain - Antique Brown Technical Data Sheet
Acid Stain - Antique Brown Safety Data Sheet
How to Apply Concrete Acid Stains
