I have been taking an inlay class with a real master here
in Tucson. He does not recommend the epoxy and hasn't used the
Devcon. He has recommended Opticon: Resin No. 224 Fracture Sealer.
He uses an 8 to 1 ratio rather than the 10 to 1 ratio. You have
about 45 minutes to manipulate the stones until it starts to dry.
Good luck! Diana
Keep in mind that Opticon IS an epoxy. Made by the same folks who
make epoxy 220 and 330. One note as well. In general, slower
setting epoxies, like Opticon, tend to be stronger more durable.
Among other things, they are sometimes better able to resist
degredation from water. Epoxy 220, for example, though it’s more of
an amber color than 330, sets more slowly, and is fully water proof,
while 330 is not quite as water proof over time. Same thing, I
believe, with the Devcons. Five minute versions are generally not
very waterproof over time, while the two hour setting ones, are
One other note to keep in mind, though the packages don’t often
emphasize it, the end strength and durability of all epoxies is quite
affected by the proper ratios of hardener to resin. Opticon is
unusual in that it can be varied for different effects, but most
epoxies are designed to cure as hard and strong as possible, while
opticon is not, intended to actually remain a viscous liquid inside
the fractures, with only the surface of the stone sealed with
hardened resin. . With most types, like 220, 330, and the devcons,
a mix of a 1:1 ratio of the two parts is specified. An error in that
ratio of as little as ten percent, in some cases, can result in a
loss of as much as half the bond strength. Measure carefully for
critical applicatons. I use, and recommend, as small scale, rather
than just a visual guess at equal amounts. Or, the twin tube/syringe
dispensers that dispense both parts at once are pretty good, so long
as you’re careful not to have different sized air bubbles in the tip
of the nozzles before you squeeze the handle.