30 minute or slower epoxy is the way to go. Do NOT thin it with anything, just put on as thin a coat as you can then heat gently with a heat gun. The heated epoxy will instantly flow out through the weave. Now, get a roll of Saran Wrap (that plastic wrap used in the kitchen make sure it is Saran, not a look alike) and cover the entire area with it. You can now smooth it out with your hands and set it aside to cure. After it is cured, you remove the Saran wrap and you have an absolutely smooth surface, perfect fairing at the edges and no sanding required.