There ARE voids. It isn't spec'ed as no-void. Typically they are very
small. Pretty often, they can be filled with (waterproof) glue or a
combination of glue and sawdust, or paint even. Given the proper level of
care, a luan boat can last for years... many years. If the use (or abuse)
of the boat dictates alternative materials, don't be a cheapskate. Buy
better plywood. Sheesh.

Ed