Not sure with coverall/Klass Kote but with Stits fabric, I would cut a small piece of pinked tape, adhere it over the damaged area and re-prime. Yes you will be able to see the repair when you are all done but working full scale planes (civilian or otherwise) are seldom the shiny pristine things that most builders model. With several coats of primer and/or paint, the patch should blend in pretty well.