Maybe the next time I need to do some fillets, I'll thicken the epoxy
with Metamucil. It's got plenty of fiber and it should help to produce
fillets that are quite "smooth" and "regular". ;-)

Offhand, that sounds like kind of a ****ty idea......
Anyway,sort of related to the topic,if I have to make a fillet of
some kind here's how I do it.I stick the corner of a sandwich bag a
few inches down into a regular soup can and drape the rest of the bag
down the outside of the can.I mix up some fillet stuff and put it in
the bag with a putty knife,twist the bag closed,snip off the corner
and end up with a disposable bag of fillet material that looks like
and is used exactly like the pastry apparatus that pastry people use
to write on pastries with,the name of which I cannot think of at the
moment,but you know what I mean,hopefully.To finish the fillet I
choose an appropriate sized socket from my toolbox,clean of the
grease,wax it up and drag it along at a low angle, ending up with a
fillet flanked by two lines of excess material, which I let set-up
enough to not be all gooey and to be easily taken off with a putty
knife. (Unrelated to the topic, Google won't let me post this as
" epoxy thickener"unless it is a followup,which it is.If I remove
the ":",everything's tits according to Mr. Google, but it starts a new
thread).