When it comes to engraving custom coasters, the best type of slate to use is fine-grained slate. This type of slate features a smooth surface that ensures clean, detailed engravings, making it ideal for custom designs, logos, or text. Fine-grained slate is also less likely to chip or crack during the engraving process, providing a durable and long-lasting product.

Another important factor to consider is the thickness of the slate. Thicker slate coasters (around 1/4-inch to 1/2-inch) provide a sturdy base for engraving and can withstand regular use without warping or damaging. It’s important to choose coasters that are specifically designed for personalization to ensure optimal results.

Moreover, look for slate that has a consistent color and texture. Darker slates, such as black or dark gray, work particularly well as they provide high contrast with light-colored engravings. Ultimately, selecting high-quality, fine-grained slate not only enhances the aesthetic appeal of your coasters but also guarantees the longevity of your custom engravings.