The best material for a reusable custom stencil depends on where and how you plan to use it.
For most branding and spray-paint applications, PET sheet and acrylic are very popular because they are durable, easy to clean, and can be cut with good accuracy. PET sheet is flexible and lightweight, which makes it useful for curved surfaces, packaging, walls, and general branding work. Acrylic is more rigid and works well when you need a strong stencil for repeated use on flat surfaces.
If the stencil is for temporary branding, labels, glass, or smooth surfaces, vinyl sticker stencil can also be a good option. Vinyl is usually better for one-time or short-term use, especially when you need clean paint edges.
A good stencil should have: