Silicone lace molds

Hi all—
I’m new to cake decorating and just purchased some silicone lace molds. I know some use sugar veil, or other specific products but is it possible to use just gum paste or fondant? What are some tips and tricks and products you have used to get a nice piece of lace. I tried fondant and I can’t get a good piece. Any advice is greatly appreciated!!
Thanks
-m