No, Willem, it's not. You can buy it here in the big DIY stores. I think I got mine in Homebase or B&Q - one of those anyway.Wow, the pictures here are even more sharp and detailed Jo, absolutely fantastic job.
You say you use Rustoleum for blackening, where in Europe do you order that???
I thought this was out of reache for the Europeans.
Be sure and store the Rustoleum can upside down - mine tend to dry out in a few months if I don't...Tom