The supplier I had is out of business.
That stuff really works when it comes to cutting down jacket fouling and when it does occur, makes it very easy to remove.
I'm not sure but I believe its basically liquid Silicone mixed with some sort of carrying liquid.
When it's swabbed into a barrel, the silicone actually penetrates the pores in the steel and helps to smooth things out.
I have enough left for treating one more barrel. I'm hoping to find more Dyna Tech Bore Coat.
If not, I'm going to look for a supplier of liquid silicone.