Small crack??? and you want to pay.... don't do it! Is it just thru the paint and not thru to the foam so it won't let water in? If so let it stay that way. If it is a small crack thru the glass in a non structural area (doubt it is cos a "small" one really won't run deep), fill it with anything epoxy based such as ding stick, araldite whatever, sand down and paint. If it is a non structural area all you wnat to do is stop water getting in