If CAs are
the cure-all for just about all bonding problems, you may
be wondering, "Why do I need epoxy?" One primary reason is
price. Epoxy costs are about one fourth that of CA. When large
objects are being bonded, economics can be a deciding factor
on choice of adhesive. The specific characteristics of epoxies
also give them advantages in some applications. All our epoxies
are mixed with a 50-50 ratio. Any scrap material or paper
scratch pad can be used as a mixing surface. We have found,
however, that the plastic tops to coffee cans work best due
to their outer border and their flexibility, which allows
the unused cured epoxy to be released and thrown away.
Squeeze out equal length beads of the desired
amount of epoxy, then mix together thoroughly with a popsicle
stick or scrap piece of material. In cold weather, epoxy takes
longer to cure (too cold and usually they never fully cure)
and becomes more difficult to get out of the bottle, especially
if its less than 1/2 full. The epoxies can be heated
in a microwave oven for about 10 seconds so that they flow
easier. The heating process, with the caps off, also releases
any moisture that can be absorbed by epoxies. Their shelf
life, therefore, is virtually unlimited.
Acetone works as the best solvent for cleaning
epoxy from brushes and unwanted surfaces before it cures.
If epoxy gets on surfaces that acetone will attack, use isopropyl
alcohol. We do not recommend any additives for thinning epoxies
due to their effect on curing and overall strength. If thin
epoxy is required, either use heat or switch to EX-SLOW
or FINISH-CURE. Epoxies bond best to clean, textured
surfaces. Smooth, non-porous surfaces should be roughened
with coarse sandpaper to improve adhesion.
A small amount of CA can be used in strategic
locations to hold parts in place while the epoxies cure. The
minute designations for epoxies refer to the working time,
i.e., the time one has before the epoxies begin to set up
after being mixed in a large mass. When spread into thinner
layers, the working time in increased significantly (except
QUIK-CURE). Working time decreases approximately 25%
at temperatures above 90 degrees F. Dont panic if your
skin comes in contact with either epoxy or CA.
While contact should be avoided, uncured
epoxy can be washed from your skin with soap and water. Allergic
reactions are rare. Cured epoxy and CA can be peeled off the
skin and usually are gone after a full day of normal activity.
UN-CURE will debond any body parts that get stuck together
if a peeling action (never pulling) doesnt part them.