Fibreglass Mesh, Self Adhesive, Alkali Resistant 50mm wide x 20 metres long. Great for sculptures, indoor or outdoor work, small mosaics you will later adhere to larger works. Tiny squares 3mmx3mm, so easy to see your work underneath if you are following a pattern or a photo. Sold by the roll $4.25
Make your own substrates with fibreglass mesh and cement based adhesive, -and expanding foam if you have large cavities to fill in.