Artum Snowbird wrote:
Walking on it isn't particularly good, but laying out some sheets of 3 feet by 2 feet of plywood makes walking on the plywood quite safe. Invest in a whole sheet, and cut up some pieces that fit your roof pattern, then start safely at one end and work to the other. Keep the sheets of plywood handy for the next time you want to do an inspection or touch up.
I'm worried about trying to use the plywood once the roof has been primered. Apparently the primer is pretty tacky so I don't know how well it will work to lay plywood on top of it while applying the roof material.