Tent Fabrics & Outdoor Gear Waterproofing (Concentrate) water based waterproofing liquid concentrate. Preserves the breathability of modern membrane textiles. Ideal for Sunbrella performance fabrics for upholstery, awnings, shade, marine Concentrate must be diluted 3 parts water to 1 part concentrate COVERAGE AREA 473.1ml. (16fl oz.) covers 240-300 square feet per bottle.