Store your markers horizontally (flat).
Always replace the cap immediately after using, even if you are just taking a short break. This will stop the ink from drying out.
Shake your markers well before use.
Press the tip of your marker gently & repeatedly to start the ink flow. Do this on some scrap paper, you may need to repeat this step each time you use your markers to get the ink flowing!
Remember when baking your object, DO NOT pre-heat the oven. The difference in temperature may cause your porcelain or glass to crack. Instead, put your object in a cold oven, then turn the oven on.
Once dry, place your porcelain or glass object in a cold household oven. Once the temperature has reached 160°C, bake your porcelain or glass object for 90 minutes to heat set your design.