LMF Browning solution. Used a sanding block with 150grit paper to open up the bores and then one thick coat and let it sit for 24 hours and then use thin coats after that. This one has about 7 thin coats on it. I let it dry over night between coats. On the 3rd and 4th coat i steam up the shower and get it hot and humid inside the bathroom and leave the barrel in the bathroom for an hour. It helps darken it.