To enhance and protect your engraved slate coasters, consider using the following finishing products:

• Food-Safe Sealants: Opt for a food-safe polyurethane sealant to protect the surface without compromising safety for food and beverages. This will act as a barrier against moisture, stains, and spills.
• Mineral Oil: Regularly applying mineral oil can enhance the natural color of the slate and provide a protective layer. It’s easy to apply and helps maintain the coasters’ appearance.
• Beeswax: A beeswax finish gives a natural luster to slate while offering water resistance. It’s a great option for those looking for an eco-friendly alternative.
• Stone Enhancer: A stone enhancer can deepen the natural colors of the slate while providing protection. These enhancers typically come in spray or liquid form, making them easy to apply.
• Clear Coat Spray: A clear acrylic spray can provide a protective layer against scratching and staining. Ensure it’s compatible with stone products for best results.

Always follow the manufacturer’s instructions for application and curing times to ensure optimal results.