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There will be some filling required. Mask surfaces that are to remain in their original state, then mix more quick-cure epoxy and fill any gaps, such as the groove left by the thickness of the saw at the front of the duct. The edges of the duct should have a crisp corner, rather than rough or rounded. We used masking tape to build a dam even with the top of the duct walls and filled the gaps there with more epoxy, which also reinforced the glue joint. The adhesive on the tape stuck to the epoxy when it cured, which made it harder to clean and prep the surface afterward, so this may not be the best solution. But it worked. We also reinforced the lower edges of the duct under the hood, where the wood and fiberglass come together, with strips of fiberglass and epoxy.
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