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About Limestone

Limestone is a sedimentary soft rock that consists of mainly calcium carbonate. In its pure state it is white, but it may be coloured by other materials. Limestone is formed either from accumulation of animal shells in a calcium carbonate cementing matrix or by crystallization from solution.

Sealing Limestone

All limestone is highly porous - a tablespoon of water on a limestone surface will be absorbed in seconds, although it does vary in porosity from piece to piece. Porosity is also affected by its finish - highly polished limestone is a little harder to penetrate than limestone with a honed (matt) finish.

Due to its high porosity it is particularly important for limestone to be sealed with a high quality impregnating sealer which will not affect its slip resistance or look. Limestone is used both outdoors and indoors, and Dry-Treat's™ premium impregnating sealers will seal limestone equally well in either.

Protection from Acid Etching

It is very difficult to seal limestone against acid attack.

Limestone and other calcite based stone such as marble and travertine are prone to acid etching. Limestone is immediately 'etched' (eaten / corroded) by any acidic material on contact - including lemon juice, cola, wine and champagne. For this reason the honed (matt) look is popular, as it doesn't show the matt etch marks as much as polished limestone. In any case, acidic substances should be cleaned up as soon as possible, and limestone should not be used outdoors in areas where there is acid rain.

Which Dry-Treat™ Sealer is Best for my Limestone?


Permanent, invisible, fully breathable impregnating sealer for water and salt, PLUS premium oil stain protection.15 year warranty when sealing is performed by an Accredited Applicator.


Permanent, invisible, fully breathable impregnating sealer for water and salt protection, plus surface consolidation. Particularly popular for sealing limestone in a saltwater environment - such as around a salt water swimming pool.


For colour enrichment PLUS water based stain protection. 5 year warranty when sealing is performed by an Accredited Applicator.

Plus STAIN-PROOF Original™ or META CREME™ for additional oil protection at least 24 hours after ENHANCE-PLUS™.

Pre-sealing Preparation

1) Any surface to be sealed should be clean and looking just as you want it before it is sealed - it may be impossible to remove stains after sealing.

2) The surface must be freed waxes or other topical coatings. Any such existing coating must be removed prior to treating with a Dry-Treat sealer.

3) Ensure the material is thoroughly dry before applying any Dry-Treat sealer.

HANAFINN Oxy-Klenza™ is a highly effective, heavy-duty cleaner which is safe to use on most types of porous surface. HANAFINN X-Duty Graffiti Kleena™ may also be used for stubborn stains.


1) Always test any cleaning chemical or sealer on a small, inconspicuous area of the surface 24 hours before doing the project, to check that it will produce the desired result. This is especially important with ENHANCE-PLUS™ to ensure the colour enhancement is what you want.

2) Always ensure the surface is completely dry before proceeding with sealing.