Horse Blanket & Pet Apparel Waterproofing Concentrate Recommended for horse blankets and pet apparel made from: Nylon, Polyester, Canvas. ECO-Friendly water-based waterproofing liquid concentrate Preserves the breathability of modern membrane textiles. Makes the fabric waterproof and dirt repellent 4 litre (1 US gallon) covers 1900-2400 sq. ft. per bottle. (32 large winter blankets)