DIY Home Improvement: How to Seal Limestone

You will be surprised that limestone can actually be a DIY home improvement project for your home. If you are in doubt as to your ability to purchase and handle limestone, you can still seek the help of professionals or study it on the internet. Limestone is defined as a sedimentary rock that is composed largely of the mineral calcite and aragonite. Basically, other than sedimentary rocks, limestone is composed of grains. These however, are skeletal fragments of marine organisms such as coral and foraminifera that have been left behind.

Limestone is very common in architecture; this is widely used in the UK and the United States as well as many European countries. Across the world, great landmarks such as the Great Pyramid and its associate complexes are made of limestone. Therefore, to trace back history, limestone is already used by most people for building purposes. In today’s time, limestone has been more popularly used in housing and business structures for finishing or accessorial purposes. It has now come to its new phase, with various types and colors depending on your choice.

Though limestone may be just a natural stone, it also needs protection against other elements in order to protect and retain its durability over the years. This type of stone can easily absorb moisture, therefore, this may cause it to discolor and may appear somewhat dirty. To avoid this, a seal is necessary over the stone surface to protect the coating all over the stone. Limestone Rockseal is available at most home improvement stores. It aims to protect natural limestone by converting it from soft material to a hard wearing water repellent finish.

The Rockseal penetrates the deep pores of the limestone and strengthen it so that the treated surface will not dust and still highlights the color of the stone. It also breaks the fungal growth and other elements while allowing the stone to age naturally. This makes it resistant to airborne pollutants, and will not be affected by CO2 or ultra-violet light.

The Process

  • The sealant is supplied in liters and must be stirred thoroughly before application.
  • Stone should be power washed with a low pressure fan spray to clean pores before sealant is applied.
  • Allow stone to touch dry before application of sealant.
  • Stone should not be washed or sealed until the mortar has hardened sufficiently.
  • Ensure site is free from dust during washing and sealing.
  • Sealant should be applied in one heavy coat only, making sure once an area is coated it is not double coated as this may cause run marks.
  • Allow at least 24 hours to dry. Allow two months for product to cure.
  • Wash out hose lines with clean water after use.