I think you have the right idea but the wrong tool, a planer would tend to
tear out your material and leave a rough unusable end product. A sander
would be a much better choice especially on made like a planer, and with a
solid not soft roller. Check out Grizzly, they have some sander made to the
same general order as a planer with a solid roller for about the same price
as a planer. These would work much better on soft material such as foam and
balsa and would give you an idea as what to look for in other machines. JMO
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