Outdoor Gear Waterproofing Concentrate Outdoor Gear Waterproofing Concentrate Specifically formulated for tent walls, ground sheets, awnings, patio furniture, backpacks, duffel bags, and hiking gear for your continuous protection against rain, wet and dirt. Dry Guy is a ECO friendly water based waterproofing liquid concentrate Preserves the breathability of modern membrane textiles. Ideal for Sunbrella performance fabrics for indoor & outdoor upholstery, awnings, shade, marine 4 litre (1 US gallon) covers 1900-2400 square feet per bottle.