It's time for me to get back to blogging about my own art and my art process. For my larger paintings, I order linen canvas from Daniel Smith in Seattle. It comes pre-primed in a roll. There is a product description on their website: "Claessens' preprimed Belgian linen canvases are among the finest produced..." Link
I have been using this product since around 1990. It's amazing and completely archival. I stretch this linen on Daniel Smith stretcher bars (which come in medium or heavy-duty). Daniel Smith bars have a much nicer lip on them than most stretcher bars you'll run across and they fit together well. I use stretching pliers and tacks. Then, I staple the canvas around the back.