^I think a few of BC's videos show brief clips of a coating machine running. It looks very old, and really difficult to use, something only a few people would know how to finesse. But I assume a lot.
There are something like 3 contract manufacturing plants in the US that can make inkjet canvas. I believe BC is closely involved with one of them, and I sometimes suspect that same plant runs some of Epson's canvases due to similarities in the packaging, batch numbering schemes, and sometimes even the substrates.
The companies that apply the inkjet emulsions to canvas are in some respects in the same boat we are. They buy a batch of uncoated canvas on giant rolls, and slit it to size. Sometimes what arrives on the boat is marginal crud, sometimes it's immaculate, and most times it's somewhere in-between. But although I have never heard this stated by a manufacturer, I'm sure they pull their hair out over seeds and weaves etc as much as we do. I suspect it's very difficult for US plants to return marginal substrate, for numerous reasons including contracts, price agreements, and cost of shipping.
I have often told canvas reps that I would be willing to pay a considerable premium for perfect canvas rolls. That would actually save me money over cheaper canvas that wastes my time and resources. But no, that will never happen, competitive pricing rules the day. Most of those who buy canvas will continue to shoot themselves in the foot over price, even though it costs them in the long run. I just wish some manufacturer would have the guts to use Perfection of Substrate as a marketing tool, rather than just hyping the emulsion. It is my heretical view that the substrate is in most ways more important than the emulsion, at least for those who print a lot.
In my opinion this last Autumn set a new benchmark for canvas substrate issues. So I have jumped ship. It's fine art paper treated like canvas for me, from now on.
It's been great these last few weeks, knowing that I can start a print on my favorite fine-art paper in the certainty than I will wind up with a completely usable print. The amount of stress relief is similar in magnitude to when I went from my clogtronic 9880 to the 8300. Have not had a surface defect so far in 1,567 square feet. Life is easy, and getting better every day. It's those little things that really get to you, and their name is Seeds.