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Hello @IanM46
Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thank you for sharing your question about how to cut the Bastion 1200 x 600 x 50mm XPS Multi-Use Insulation Foam Board.
If you are cutting it in a straight line, I suggest using a ruler to draw a cutting line and using it as a cutting guide as well. I recommend using a Craftright 18mm Snap-Off Knife with its ability to extend its blade to full extension. I suggest cutting a shallow guide first and working your way deeper into the foam board.
However, if you are cutting curves and unusual angles, I suggest using a craft knife in combination with the snap-off knife. Please make sure to wear gloves and safety goggles when handling these tools. Are you using the foam board for your window or are using it for another application?
If you have any other questions we can help with, please let us know.
Eric
