Which waterproof spray for cover

[Toyelectroman]

I am looking to treat my boat cover with a waterproof spray. My cover has never been treated as I use to store my boat in a garage, but this year I had to store outside. I plan on just ordering off if amazon but not sure which brand to use. Anybody have a preferred brand to use?

 

[Horigan]

303 Fabric Guard

 

[JASinIL2006]

303 Fabric Guard

This stuff is great.

 

[Bondo]

Ayuh,..... Back when I had a sunbrella converible top on my ole tin fishin' barge, I tried various canvas waterproofers,....
Most all of 'em relied on spray silicone as the active agent,.....
So,.... I'd go to my local Napa, 'n buy 100% silicone spray at 'bout 1/2 the price of the canvas sprays, 'n it worked, Perfectly,... No leaks,....

 

[robert graham]

Rustoleum makes a spray called Neverwet that is excellent….but the silicone sprays are good also…..

 

[Wave34]

I use a product made for camping canva tents and it works very well and a lot less expansive ($50 CND per gallon)

Instructions say to brush the product, but I remove the roof from the boat, and after washing it, and drying it overnight, I use a spray bottle (pump type) and soak the canva. Works well.