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Hi again, Dave and thanks very much for your Excellent rating!I found one more thing for you--a YouTube video.
Here is a video from YouTube that may help. Covering the cake with fondant over the frosting will give you a smoother surface to apply the tinted piping gels over, to create the stained glass effect.
The piping gels can be found in most supermarkets near the frostings and in cake decorating and craft supply stores that carry those types of products, usually by Wilton.Best regards,Cher