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17 Nov 2020
Limestone paving has grown in popularity in recent years and is widely available from builders' merchants and DIY outlets. Although it is available in a broad range of colours, black and slate grey seem to be very much in tune with current fashion trends. However, there is one problem with "black" limestone - and that is it doesn't seem to stay "black" for very long. In fact, the deep "black" seems to fade out in a few months, leaving a sort of "battleship grey" shade. Unfortunately, many sellers of this paving seem to have a "black out" about this "black out" issue, and customers don't find out until several months down the line.
Whether the true culprit is UV light degradation or rain penetration is probably unimportant; the one question that callers to our advice line ask is, "Can faded limestone be fixed?" Well, the answer is "yes." Sealing it with Kingfisher "K-Seal" brings out the colour and adds protection because the first coat actually penetrates the substrate of faded limestone, while the second coat forms a protective seal against the elements, deepening the colour. Beware of cheap sealers or "enhancers" - these are often low-grade formulations made with "linseed oil" diluted in recycled white spirit and simply will not provide any longevity. "Kingfisher K-Seal," by contrast, is a professional formula acrylic resin suspended in premium virgin solvent.
Ideally, you should leave new limestone paving for 4 to 6 weeks before sealing it. This will allow time for any efflorescence (white salts) in the pointing mortar (joints) to develop as the mortar fully cures (approximately 1 inch per month). Wash the paving with warm water and a little soap, and rinse thoroughly. Apply the sealer only to a dry surface and in dry conditions with no rain expected.
You can apply by brush, but a disposable roller works best. Avoid "ponding" of the sealer and read both the product data sheet and safety data sheet carefully before use.
Limestone paving, with its natural beauty and durability, has become a preferred choice for many homeowners and landscapers. Its versatility in design and the range of colours available make it suitable for various outdoor settings, from patios to garden paths. However, the issue of colour fading, particularly with black limestone, can be a significant concern. The fading not only affects the aesthetic appeal but can also lead to dissatisfaction among homeowners who expected a long-lasting, vibrant colour.
The process of sealing limestone paving is crucial in maintaining its appearance and longevity. Kingfisher "K-Seal" is recommended for its effectiveness in restoring and protecting the colour of the limestone. The application process is straightforward but requires attention to detail to ensure the best results. By following the recommended steps and using a high-quality sealer, homeowners can enjoy the beauty of their limestone paving for years to come.
In conclusion, while black limestone paving may face challenges with colour retention, proper maintenance and the use of a reliable sealer like Kingfisher "K-Seal" can significantly mitigate these issues. Homeowners should be aware of the potential for fading and take proactive steps to protect their investment. With the right care, limestone paving can remain a stunning feature in any outdoor space.
