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I try the carving knife, I don't own one currently but a $10 target / walmart special is not too high a cost. Less than most of the power tools I buy. I did learn from looking at the Metan photo pages that to do the foam they tip the boat, rather than hope it runs in the correct direction. I have done foam work on the outside and it goes everywhere but where you want it. Learning how they directed the foam up under the deck was important.

Great suggestions everyone.