Instructions
Clean off the fabric roof before applying the PTEF waterproof spray. If the canvas is especially dirty, use a sponge with soap. Otherwise, just spray it off.
Let the canvas dry naturally until it is completely dry.
Spray the PTEF waterproofing solution on the canvas. Spray until you can see the canvas is saturated and looks darker than the parts that have not yet been sprayed.
Let the PTEF dry on the canvas for the next six hours.