The epoxy used to secure
the fins and centering rings is Loctite Hysol E-20HP. It is a high strength
industrial adhesive with high sheer strength and resistance to peeling. It
can be purchased at
McMaster-Carr (part number 6430A19) for about $12 for a 50ml
cartridge. An applicator gun (part number 74695A71) and a mixing
nozzle (part number 74695A12) are also needed. The gun uses a
ratchet scheme to push a plunger into the cartridge. The plunger
pushes out the correct 2:1 ratio of resin and hardener. The mixing
nozzle is a long plastic tube with a spiral type internal construction
that causes the two streams of liquid to intermix before exiting out the
tip. There is no measuring and no hand mixing necessary. The
2:1 mix ratio is always correct. The nozzle also makes it extremely
easy to apply the epoxy exactly where it is needed. All of
this speeds up the work and cuts down on wasted epoxy. This system
is very handy and a real pleasure to use! The gun is about $25 and
the mixing nozzles are about $1 each. The mixing nozzle mounts onto
the front of the cartridge with a type of bayonet scheme. It can be easily
removed and is disposable. Once removed, the cap can be replaced onto the
front of the cartridge. It too uses a bayonet mount scheme.
The photo on the left above
shows two other types of epoxy adhesive that use this same scheme. The E-120HP gives a longer working time (120minutes). It is a
non-sagging, aerospace grade with superior resistance to rapid temperature
changes. It has high shear strength and resistance to peeling. The E-60HP
is a metal and plastic bonder with high sheer strength and peel
resistance. They are part numbers 6430A24 and 6430A28 respectively.
There are many other types of epoxy available for this system as well.