Products: Concrete Acid Stain - Antique Tan, Concrete Acid Stain - Antique Blue, Concrete Acid Stain - Antique Green, Concrete Acid Stain - Antique Red, Concrete Acid Stain - Antique Brown, Concrete Acid Stain - Antique Black.
Fortis Concrete Acid Stains are penetrating reactive stains that create permanent, variegated colour in cured concrete. Unlike paint or surface coatings, acid stains react with minerals in the concrete to produce natural colour variation.
Antique Tan – Warm tan and aged earth tones.
Antique Blue – Blue-green and aged patina tones.
Antique Green – Green and blue-green patina effects.
Antique Red – Red and terracotta-inspired tones.
Antique Brown – Rich brown, bronze and earth tones.
Antique Black – Dark charcoal and black aged-stone effects.
Suitable for porous interior and exterior concrete including floors, patios, pathways, entertaining areas and architectural concrete.
Every slab reacts differently. Concrete composition, age, porosity and finishing influence the final colour, so always test the stain on the actual concrete first.
Concrete must be clean, dry and porous. Remove existing paint, coatings, sealers, wax, grease and contaminants before application. Do not prepare the surface with hydrochloric or muriatic acid.
After staining and cleaning, apply a compatible Fortis clear concrete sealer where protection and colour enhancement are required.
Fortis Concrete Acid Stains create permanent colour within the concrete rather than covering the surface with an opaque paint film. The chemical reaction produces natural variation, giving every finished floor or surface its own appearance.
Key benefits include:
Acid staining is designed to create variation. The colour achieved depends on the composition, age, porosity and finishing of the concrete as well as the application method.
Acid stain should not be selected where a completely uniform painted colour is required.
Always test the selected stain on the actual concrete before completing the full area.
After staining and cleaning, a compatible clear concrete sealer can be used to protect the surface and enhance its appearance.
Natural-look sealers maintain a more subtle appearance, while wet-look and gloss sealers generally deepen the stained colours and increase contrast.
For the best results, follow the Fortis preparation, application and sealing recommendations for the complete system.
What is a concrete acid stain?
A concrete acid stain is a penetrating reactive stain that chemically interacts with minerals in cured concrete to create permanent, variegated colour.
Does acid stain sit on top of the concrete?
No. Unlike paint, acid stain penetrates and reacts with the concrete rather than creating an opaque coloured film over the surface.
What colours are available?
Fortis Concrete Acid Stains are available in Antique Tan, Blue, Green, Red, Brown and Black.
Will the finished colour match the colour chart exactly?
No. Acid staining is a reactive process, so the final colour varies according to the concrete's composition, porosity, age, finishing and application technique. Always test an area first.
Can acid stain be used outdoors?
Yes. Fortis Concrete Acid Stains can be used on suitable porous interior and exterior concrete surfaces.
Can I acid stain old concrete?
Yes, provided the concrete is sound, porous and properly prepared. Existing coatings, sealers, wax, grease, adhesives and contaminants must be removed.
Can I acid stain sealed or painted concrete?
Not directly. Paint, coatings and sealers prevent the stain from penetrating and reacting with the concrete. They must first be completely removed.
Should I acid wash concrete before applying acid stain?
Do not prepare concrete with hydrochloric or muriatic acid before acid staining. This can interfere with the minerals needed for the staining reaction.
Does acid-stained concrete need to be sealed?
A compatible clear sealer is recommended where additional protection, easier cleaning or colour enhancement is required. The chosen sealer can also change the final appearance of the stained concrete.
Is acid stain suitable if I want one completely uniform colour?
No. Acid stain is specifically designed to produce natural colour variation and mottling. A coating system is generally more appropriate where a uniform solid colour is required.
