Does anybody know a good type of suitable glue to repair a delaminated sole on (modern) cross country ski boots with plastic soles (Rottefella NNN in particular). The delaminated part is in the front with a bar for latching in a binding, so it has to withstand substantial forces. I am not 100% sure about the midsole (boot) material, but it's probably either soft plastic or gummi.
I am not sure if any common glue intended for trekking/walking shoe resoling will provide enough adhesion and/or will stick to plastic sole. Nevertheless, I was not successful when looking for information or advice targeting modern XC skiing boots in particular, so any hint is welcomed.
EDIT: I suspect the plastic is polypropylene (immune to acetone, and burn test on small chip, I cut away, suggests this too – though hard to tell from such little sample, so not 100% sure). This would rule out most of the common glue types on market, as these are usually not suitable for PP and PET, I am afraid