Just a couple comments. Tried and True makes a true boiled linseed oil. It is a more modern process than the old time boiling, but it works the same. No chemical driers added.
Years ago I made a ground cloth using Thompsons Water Seal. I hung the canvas up and proceeded to apply half of a gallon to it. I did one side, let it dry, next coat from the other side, let it dry, etc. It smelled to high heaven for about a year in hot weather, was stiff the same time. I finally laid it out in the grass and walked all over it in street shoes and it softened up. The odor went away by itself. I have slept in some rainy weather in that thing, and proved it did not leak. Kept me dry as long as I kept the edges of the cloth above the standing water.
I do know that Thomson's has changed their formula from what I used. No idea what difference the change was to the formula or how well the new one works.
Years ago I made a ground cloth using Thompsons Water Seal. I hung the canvas up and proceeded to apply half of a gallon to it. I did one side, let it dry, next coat from the other side, let it dry, etc. It smelled to high heaven for about a year in hot weather, was stiff the same time. I finally laid it out in the grass and walked all over it in street shoes and it softened up. The odor went away by itself. I have slept in some rainy weather in that thing, and proved it did not leak. Kept me dry as long as I kept the edges of the cloth above the standing water.
I do know that Thomson's has changed their formula from what I used. No idea what difference the change was to the formula or how well the new one works.