I am building a new hatch lid from two 4mm ( ~1/6"") sheets of marine
ply. Reinformcement structures will follow. My question here is: How
much glue (epoxy resin plus cotton fibres as thickener) is the
optimum? My felt guess is 0.1 to 0.2 mm, i.e. ~1/240 to 1/120". Less
is hardly possible, more? The curvature is about 15 mm elevation in
the middle of a width of 600 mm.

Cheers, and TIA,

U.