Canvak

Retreat your canvas tents and tarps to make them water resistant again. Easy to apply: just clean and dry surface to be treated, then brush on Canvak. Let it dry.
Available: One gallon.

Canvak is not recommended for use on vinyl finishes or synthetic fabrics or to tents that been treated with a waterproofing by the manufacturer that would form a waterproof film on the surface of the canvas. Be very careful to test it before applying to a complete tent.