My boots need sone help. The binding between sole and upper where the toes flex is coming appart. Ive been looking at shoe glue ( shoe goop, gorila, superglue?) but i cant tell if it will dry rigid and fall apart in few days, since its in the part the boot flexes most. Any recomendations? Picture here ( yes they need cleaning): https://imgur.com/a/NMKufoC Ta!