I haven't been using it for very long. Only for a few months, in fact. I will say that if you have not yet tried modeling paste, then you absolutely MUST. I'ts easy to use, very lightweight for your layouts, and looks awesome! I learned quite a few techniques through How to Use Modeling Paste on Any Project with Christy Butters over at the Art Studio.
I love Summer by Christy Strickler Supplies Cardstock: Colorbok; Patterned Paper: We R Memory Keepers; Stickers: October Afternoon, We R Memory Keepers; Modeling Paste: Liquitex; Mist: Tattered Angels, Home Made; Ink: Tsukineko; Wood Shapes: Studio Calico; Other: Stamp
For this layout, I used modeling paste with a Crafter's Workshop Stencil. I love the dimension it adds, as well as the texture. Stencils are my favorite way to use modeling paste.
I am looking forward to using more mixed media techniques on future layouts. Using new mediums has been a great way to extend my supplies while adding more texture and dimension. Expect to see me taking more mixed media style classes over at the Art Studio.