This is a common scene where we live. The aftermath of local quarrymen chasing the bluestone. I did this with acrylic to make sure it would be ready for the Rittenhouse Square show in early June. All that white would still be tacky ( not really ) and it wouldn't have any varnish. This took 4 days. about 10 or so hours. It's done! Varnish next week and ready to hang.