I think that will be enough. Consider what Wellcraft had on top of the deck, like .030" of Chopped Strand Matt. How thick was the glass where you cut the old floor out? My thinking, the floor is firmly glued in place atop the stringers so the most critical area is the joint around the perimeter of the new floor and any joints in the field.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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