Don't fiber glass, Epoxy.
I use West Systems Epoxy, www.westsystem.com . I buy it in medium size quanities from West Marine, www.westmarine.com . They carry fabric, several types of resin, hardener, pumps, fillers and mixing cups. And my favorite item is the Epoxy Scale. It allows you to mix small batches accurately. It costs about $32 and is worth every penny.
I built a small tote to keep my Epoxy supplies all in one place. Except for large pieces of fabric everything, including the scale, are right at your fingertips.
See also Epoxy.