In alt.home.repair, on Wed, 17 Feb 2021 13:06:15 -0500, JB Haskins
wrote:

I have a small project that needs epoxy to bond one section.
Unfortunately, the area where the epoxy needs applies is narrow. The
last time I tried it, I attempted using a cut off syringe, like
diabetics use, except the needle was cut off and the cylinder cut away
until is was maybe 1/8 to 1/4" thick. Unfortunately, I was not able to
draw any of the mixed "5 minute" two part epoxy into the syringe as it
was too thick.

The epoxy I'm using is just the small, twin cylinder type that premixes
in either a small tray as part of the package or in something else. I'm
just wondering what I can do to lessen the viscosity without
compromising strength or other properties when dried. I was just
thinking of putting the package under a heat lamp set at like 110 F for
a couple of hours. Thoughts and experiences welcome and thanks in
advance.

I still don't fully appreciate your problem but I'll also recommend
PC-70, which is grey, and a simlar product which is white.

They are not thin at all but they are like modelling clay and once
mixed, maybe you can forced it in your crack with a spatula of some
sort.

They stick ot anything, even glass apparently, and I first used it to
patch a drain while the faucent was dripping. The mixed glue kept
droopin down as the water hit it but I kept pushing it up and after a
few minutes it set and the drain didn't leak!!

Two four ounce cans seems the best size. If you're careful to never let
one can's stuff touch the other can's, it lasts for years, maybe
forever.