Be vigilant if you use a spirit based waterproofing. I used Thompson's on
my sailboat.. It waterproofed my dodger but damaged the see-through plastic
and all my plastic zippers fell apart within 2 months.
There are two types of waterproofing: One for previously oiled canvas
and another for synthetic fabrics.
It's really quite simple: use the oily type for oily canvas (heavy
tarps on trucks etc) and the other type for everything else like
sunbrella, nylon etc. Don't confuse the two types of waterproofing.
If you must know what happens otherwise: Just come by, look at and
feel my dodger if you're in the neighbourhood. It's history!!!!
George of Scaramouche1, who sometimes learns the hard way....