Hi, googling "Evo-stick metal epoxy" brings up only an epoxy putty, which might not have the best adhesive properties as it's really a filler. If that putty is the stuff you're using, I'd suggest changing to a proper epoxy adhesive, such as Araldite. Epoxy resin is hard to beat as an adhesive.
Edit, now found "Evo-stick 2 part epoxy", so above comment might be misguided.
Edited By Clive Brown 1 on 29/11/2020 14:44:06
Edited By Clive Brown 1 on 29/11/2020 14:46:06