FWIW, I've never used Timeless but I have used diluted Glamour II and the generic ready to spray coatings from Lexjet. I use the prior version of the current Wagner 518080 HLVP sprayer. I tried rolling coatings on canvas early on and quickly gave it up. Unless you're trying to create a textured surface, in my opinion, spraying is the only way to create a professional, uniform coating.
My technique is pretty simple. I place the printed canvas on a large flat surface, outdoors, and apply the spray coating back and forth in much the same way an autobody painter applies paint. I start the spray before reaching the edge of the canvas, to avoid drips, and overlap passes, all in one direction. Instead of waiting for that coat to dry, I immediately start passes at 90 degrees to the first pass. When I have finished the canvas has a slightly milky look that dries clear. If there are bubbles in the coating I use the pressure of the compressed air that comes out of the sprayer to level the bubbles. I spray at about 8-12 inches from the canvas surface.
It's really pretty easy once you do it a few times and the results are predictable.