really no advice for the kitty.. sorry.. the vet might be more of help.. but I wanted to input about the invisible bandage spray..

my parents have that.. for people though.. and they use it in their fingers when bowling... as sometimes the fingers get stuck and you get lil cuts.. I´ve used it before too and it´s great.. it really seals the skin.. not sure about diabetic wounds.. but you can ask if it would do to