I too tried this- Industrial Coverage Corp? Phone calls ,emails, paper mailed app form, online app form, no reply at all. Don't know what could be going on there. It became obvious that if a certificate of insurance to get into a show or god forbid a claim needed? If they won't even sell it then after the sale does not look good.
Talked with the owner of a local Erie agency that took the time to hear story- pictures of work were needed, a few lengthy phone calls to clarify what it is you do, trouble is it is not a clean fit into a normal category. Artist, sculptor, ornamental iron was able to fit apparently but it took some time to figure out.