I was installing tackstrip on concrete the other day and I don't like the long nails that come with the strip. They are usually not straight so of course the result is a failed nailing, and they are too long which makes the concrete crack and another failed nailing. I've been using a short concrete stub nail either 1/2 inch or 5/8 inch which work much better. Hopefully this info. will get back to the tackstrip companies and they will switch to a shorter nail.