I always recommend this test. Put some 24hr shafting epoxy on a paper plate with some store epoxy next to it and let them dry over night. Next day pic up the plate and bend both glue samples. The shafting epoxy will bend and the store epoxy will snap. Shafting epoxy is designed to have some flexibility for shock absorption.
I have used store epoxy on clubs twice because I was in a hurry. One was a putter head and one was a steel shaft extension. My bag fell over on the cart path. The putter head hit the pavement and came off. The extension was in a fairway wood. During the round I felt the upper inch wiggling. The extension came loose. And I could not get it back out of the grip and had to toss it.
A small set of shafting epoxy is not that expensive and goes a long way.
