A marble sealer is usually made of highly toxic solvents that can be degrading to the health. However, you can make your own marble sealer by a simple mixture of drying oils and mild solvents. While linseed oil is a good drying oil to use, it does cause discoloration on marble so the best oil to use is Tung oil. Tung oil is derived from the nuts of the Tung tree—a tree common in China. When applied on a wooden or stone surface, it dries out completely to leave an effective barrier against water and other contaminants. To act as a marble sealer, however, it has to be mixed with a mild solvent. Read on for more information.
Step 1 – Preparation
To make a sealer out of Tung oil, prepare equal amounts of citrus solvent and Tung oil. The solvent is an important ingredient in the marble sealer because it allows the oil to be evenly spread on the surface of the marble and to dry out completely. Citrus solvent is also a natural and safe solvent that can replace naphtha and mineral spirits that are commonly used to prepare sealers. To prepare the mixture, pour one part of citrus solvent and one part of Tung oil in a plastic container. Never use a metal container because metal may react negatively to the mix.
Step 2 – Cleaning the Marble
In order to produce a great finish, the marble should be free from dust, debris, stains and discoloration. Never use vinegar to clean the marble because it is too acidic and may cause more damage than good. Use baking soda paste instead along with hydrogen peroxide if necessary. Or, make use of a damp cloth to clean the surface. If it does not have any stain whatsoever, use a clean cloth to wipe away the dust and debris on the surface.
Step 3 – Applying Tung Oil Sealer
When using a cloth to apply the sealer, make sure to use rubber gloves to protect the hands. Soak the cloth in the mixture and use it to spread a thin coating onto the marble. Make sure that the thickness is consistent. If not, place the sealer in plastic spray bottle and spray in on the marble. Another way to apply the sealer is to paint it thinly using a brush. Since the Tung oil easily dries off unlike other drying oils, a coating is okay. Allow the first coat to dry before applying the next coat.
Step 4 – Applying the Finishing Coat
Apply another thin coat if proffered and allow it to dry before applying the finishing coat. The finishing coat should be applied thickly to ensure that the sealing effect lasts longer. Unlike other drying oils, Tung oil dries completely and a lot faster so it is okay to apply a thick coat for the last coating. Allow the sealer to dry.