Preparing slate coasters for engraving is essential to achieve the best results. First, ensure that the coasters are clean and free of any dust, oils, or debris. Use a soft cloth dampened with a mild soap and water solution to wipe down the surfaces. Rinse with clean water and allow them to dry completely.

Next, inspect the coasters for any imperfections or rough edges. If necessary, lightly sand the surfaces with fine-grit sandpaper to create a smooth area for engraving. Be sure to remove any dust created during this process by wiping it down again.

After cleaning and sanding, you might want to apply a light coat of a specialized primer or sealant designed for stone to help the engraving stand out and protect the slate. Allow this primer to dry thoroughly.

Finally, plan your design carefully. It’s advisable to sketch out your design on paper first or use a template. Once you feel confident with your setup, securely position the coasters to prevent movement during engraving. Following these steps will ensure your slate coasters are well-prepared for a clean and precise engraving.