I can assure you that your first-time result is *FAR* better than mine
(for which no pictures will ever be found on the Internet ;-) Good job.
Those corner voids are usually not caused by improper rolling, they are
usually caused by the material/resin pulling away from the corner
because of surface tension during the curing process. That's where an
initial bead of epoxy and filler (glass fibers, micro-balloons, wood
flour, saw dust, kevlar pulp, etc) is used. Mix the putty to a
consistency of a creamy peanut butter. Just put a small bead of putty in
the corner after spreading the initial coat of epoxy on the mold, but
before laying in the first layer of mat. The putty will squeeze out as
you roll the mat in, but it will always fill the corner, producing a
sweet edge when you pull the part out of the mold. I use kevlar pulp
almost exclusively for that purpose, because it yields a rock-hard,
extremely durable corner. Don't take too long spreading the putty and
laying the first layer, because the putty cures faster than resin by itself.
With regards to filling the voids. If you used "epoxy resin" for the
molded part, then just create a putty from the same epoxy resin using a
filler (see list above). Epoxy always sticks to itself. If you used
"molding polyester resin" (which does *not* include wax), then both
epoxy and polyester putty will work fine for the filler. If you used
standard "polyester resin" (the stuff from auto parts or marine stores)
it contains a "wax" to help it cure. So, you'll need to rough sand the
void to remove the wax layer before filling will either epoxy or
polyester putty. (FYI: Bondo is a polyester putty). When making your
own putty, mix it to a consistency of a stiff peanut butter.
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