http://weightweenies...php?f=3&t=75204
"materials needed
Soapy water. cleanser, and brush/sponge
80-100 grit paper
lint free rags
acetone
thixotropic structural epoxy(high peel and sheer), 2k such as
3M-DP420
Hysol 9430
mixing/spreading tools(tongue depressing sticks)
clean cardboard to mix epoxy on
NOT thin runny stuff. not 5min hardware store crap.
Is this a face mounted shell or ID/OD? in other words, where was the glue, on the OD of the alu and ID of the carbon or did the alu have a flange with glue on the faces?
steps
remove all parts
thoroughly clean, degrease alu and BB area of frame with soap, water
thoroughly dry
thoroughly clean all surfaces with acetone
sand away all remnants of the old glue
insure parts mate easily in a twisting action, no hangups
confirm a min .005"ish/max .010"ish bond gap on the radii
sand once more, all mating surfaces with the 80/100 paper, do not over sand to deformation
thoroughly clean all surfaces with acetone once more
allow to fully dry but your bonding window is under 1hr and lower in hi humidity
mix epoxy per data sheet
using sticks, apply and even thin coat to all surfaces
twist together slowly, pausing to use clean sticks to clear away excess epoxy piling up at each end
once all together, use acetone on rags to clean away the excess including the threads. use a q-tip if needed.
do not try and grease the threads first, if you muck it up you may contaminate your bond
be advised the acetone may cause some blushing or softening of the clear coat in that area, test it first.
leaving crank or BB parts in the shell will make this a very difficult job. and frame builders will laugh at you if you do.
good luck"