Yes, you can seal a Black Gold Marble countertop yourself. Sealing the countertop helps to protect it from stains, water damage, and other types of wear and tear. Here are the steps to seal your Black Gold Marble countertop:

1. Clean the countertop: Start by cleaning the countertop thoroughly using a mild dish soap or stone cleaner. Rinse it well and make sure there are no dirt or stains left on the surface.

2. Dry the surface: Allow the countertop to dry completely before applying the sealer. It is important to ensure there is no moisture on the surface.

3. Choose a sealer: There are various types of sealers available for natural stone countertops, including marble. Select a sealer specifically designed for use with marble or stone products.

4. Apply the sealer: Follow the instructions on the sealer bottle for the correct application method. Generally, you can use a clean cloth or sponge to evenly distribute the sealer on the surface of the countertop. Make sure to apply the sealer in a thin and even coat.

5. Let it penetrate: Allow the sealer to penetrate the marble surface for the recommended time specified by the sealer manufacturer. This will give the sealer enough time to bond and protect the marble.

6. Remove excess sealer: After the recommended time has passed, gently wipe away any excess sealer from the surface using a clean cloth or paper towel. Make sure not to leave any streaks or residue behind.

7. Allow it to dry: Let the sealed countertop dry completely. The drying time will depend on the specific sealer used, so refer to the instructions provided by the manufacturer.

Keep in mind that sealing your Black Gold Marble countertop may need to be done periodically, depending on the usage and the sealers longevity. Always follow the recommendations and instructions provided by the sealer manufacturer for the best results.