DIY Sharpie Coasters
Make Sharpie Coasters using regular tile (not unglazed) from any home improvement store, rubbing alcohol, and a sealer.
To find the right type of sealer I had to go to the post this DIY is based on, and then read the comment section. The sealer the original author used is Watco brand Clear Lacquer. Some readers used Automotive Engine Clear Coat spray paint (VHT SP 145 engine enamel). The people who used Mod Podge were very unhappy.
The tutorial the DIY Sharpie Coasters is based on, is a DIY Alcohol Ink Coasters Tutorial by Artisan des Arts for The Crafted Life HERE. There are 199 comments about this DIY, and they are worth reading.
What Else Can You Do with Alcohol Inks?
You can use alcohol inks on glossy paper, dominoes, metal, shrink plastic, glass, polymer clay and other slick surfaces.