I was poking around
in my storage and found about 5 yards of Herculite/Aquuatex II, left over
from some Navy contract jobs

Steve, I remember this stuff from my navy days. If you are enclosing your
bimini area with side windows, prepare for a hot and humid environment.
Secondly, I seem to recall that its uv resistance was not near that of
sunbrella, of which I use exclusivley
for all my canvas product. Your Herculite could be used to reinforce the edges
for grommets and snap type hardware. or use it for lee cloths. Which ever you
chose may I recommend using Gortex Tenara thread for your project. the stuff is
gaurenteed to outlast the canvas for uv exposure. Its more expensive but worth
the time spent on resewing rotted seams.
just some thots
robert