You will likely feel the weave after two/three coats of epoxy due to "translation", much as snow covers the ground, but you can still see the shape of abjects beneath it. Any more than three coats is probably overkill. It should sand out smooth at that point.

: I've completed all the fibreglassing of my Great Auk both inside and out, and
: have rolled on the "fill coat" of epoxy on the outside in order
: to "fill" the weave. My question is how "fill" does
: the weave need to be prior to varnishing? In some spots on the outside,
: the pattern of the glass still shows through while in other spots the
: surface is flat and shiny with resin. Please note that in some rough spots
: (most commonly near the edges) I'll have to put some skim coats of epoxy
: to smooth up the surface before sanding (ie. avoid sanding into the
: glass)in order to get a "fair" finished surface, but in other
: currently "fair" spots where the fibreglass weave still shows
: through I'm wondering will the 6 coats of varnish take care of it (ie.
: make it totally smooth in the end)?