Yes, but before applying Wallrock KV600 Thermal Liner, you must lightly sand the ceiling and size with a PVA or Flake Adhesive, this will form a good surface for the Thermal Liner Adhesive to adhere to.
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Tackling external corners with Wallrock KV600 Thermal Liner?
Well you have 2 options with Wallrock KV600 Thermal liner
1) It will bend around the corner and this will give you a rounded corner,
2) You can cut and butt joint at the corner – this option is best if you are applying a Wallrock Lining Paper or Wallrock Textured paper on top as it will hide the joint.