I have just noticed that there is bubbles under the paint around the gutter inserts in my A6 Avant. Being a twonk and looking at how bad the damage is, I removed the gutter trim and with it came a fair bit of paint. The rust has not gone through, but the channels and the roof has some very obviouse bubbles and now missing paint. I know nothing of body work. Can this be treated and sprayed without costing the earth???