How to Seal a Limestone Fireplace

How to Seal a Limestone Fireplace

Limestone is a natural stone, so every fireplace will have its own markings, colour variation and small imperfections. You may even find fossils within the stone. It is also porous, which means it can absorb moisture and marks if it is left unprotected. Whether you have chosen one of our limestone fireplaces or a separate limestone fire surround, applying a suitable sealer will help protect the stone.

Why Does Limestone Need Sealing?

A natural stone sealer helps reduce absorption and makes the surface easier to look after. Without protection, liquids, dirt and oils can soak into the limestone and leave marks that may be difficult to remove.

When Should You Seal a Limestone Fireplace?

A limestone fireplace should normally be sealed before or shortly after installation. The surface must be free from dust, dirt and existing marks before the product is applied. For advice on preparing the stone, read our guide on how to clean a limestone fireplace.

Choosing a Limestone Sealer

Always choose a product suitable for limestone and natural stone. At Castfireplaces, we use and sell LTP Mattstone Sealer. We have used it on the limestone mantels in our showroom and on other natural stone surfaces. It helps protect the limestone while keeping its natural matt appearance.

How to Apply Limestone Sealer

Always follow the instructions supplied with your chosen product.
Before you begin:

• Protect the hearth, insert and surrounding floor.
• Make sure the room is well ventilated.
• Test the product on a small, discreet area.

We have found that a clean microfibre cloth works well when applying LTP Mattstone Sealer. Spread the product evenly and remove any excess as directed. Allow it to dry fully before touching the stone, lighting the fire or placing ornaments back on the mantel. Some sealers may require more than one coat.

Does Limestone Need Resealing?

The fireplace may need to be sealed again over time. How often this is required will depend on the product used and how much wear the fireplace receives. Follow the manufacturer’s advice and reapply the sealer when recommended. Sealing your limestone fireplace correctly will help protect the natural stone and keep it looking good for years to come.