Hi All
I have just found this product which you may know of and may be useful.

Kiwi Camp Dry Water Repellent

Quote Originally Posted by Westforth Sports
Kiwi Camp Dry Water Repellent
In Stock List Our Price
N $5.00 $3.00

Detailed Description
Kiwi Camp Dry Water Repellent

Kiwi Camp Dry is a heavy duty water repellent spray that contains 13% silicone for lasting, breathable protection of tents, tarps, awnings, rain gear, boat covers, hunting clothes, camping equipment and leather and canvas footwear. No ozone depleting substances. Net wt. 15 oz. (425 g).

* Low Odor Formula.
* Fast Drying - in as little as 3 hours!
* Non-Yellowing - on canvass & other outdoor fabrics.
* Silicone Bonds to Leather/Fabric to create an extremely tough water barrier, while still allowing the article to breathe.
* Ideal for tents, canvas, boat tarps and covers, heavy weather and boating apparel, boat biminis, flybridge enclosures and equipment covers.
* Odorless when thoroughly dried and cured.