How to Trace a Pattern for Glass Painting. Once you have the glass clean and ready to paint on, it is time to do one last thing to the design. You need to trace the design that you have already put on paper. This thickens the lines and prepares it for the glass paint liner that is often spread onto the glass using the nozzle on the paint container.
Lay the design out flat on your work area.
Use a thick permanent marker to trace the outline of the glass painting design. This thickens the lines so that they more closely match the width of your glass paint liner.
Affix the design inside the glass using tape.
Use the black glass painting liner and carefully trace, on the glass, the thicker lines that you just traced directly over on the design.
Let the liner paint dry before adding any color.
Tracing an image creates body memory of the image. This allows you to trace it the second time with the liner paint more smoothly, alleviating much of the stuttering affect that may otherwise be seen when first learning to do glass painting. If you are using black liner, you may want to trace the image in green or red so that it is easier to see where you have or haven't added liner. You can get a variety of glass designs from clip art sites such as Barry's Clip Art Server, or you can purchase pre-made designs from craft stores such as Michael's.