: You will need to use bias cut cloth to have any hope. This is just fiberglass
: cloth cut on a diagonal to make strips. It is also a great help to round
: out the corners slightly. For external corners this is just a little
: sanding. On interior corners you need to create a fillet. This can be some
: shmutz made with epoxy and filler like cabosil or it can be a bundle of
: fiberglass strands.

With what Nick said add the following:

On external edges you can whip that glass into shape by taping and stretching and taping plastic
kitchen wrap over the wet glass. Obviously, you need an adjacent dry surface to tape to. You might
have a few rough spots if you have wrinkles in the plastic wrap, but it will only be resin and easy
to smooth out.

On internal edges, a less tested method (for me) is to coat with resin and wait until it gets sticky
and press the glass into the flats and into the sharp corners. You have more chance of having
trouble with wrinkles but it will work if you get your resin to the right level of sticky.

Don't know what the right level of sticky is?
Do a test! Always do a test FIRST!

Rob