Brian Gray
Posts: 339
Joined: 2004-01-21
Location: Sandusky, OH
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The point of a self-healing cutting mat is really just to keep your scalpel or chisel edge keen. It has nothing to do with a clean cut on the veneer.
I use a self-healing mat every time that I can, but there's nothing wrong with MDF. You will simply need to sharpen your chisel or scalpel more often than if you use a self-healing mat.
I haven't tried using insulating foam, but my first instinct is that it would not be solid or tough enough.
I would guess that the veneer would just collapse and splinter when you got enough pressure to sever it.
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