Canvas bags are simple and durable, which is probably the reason they've been in use for so long. Canvas, a heavy material, is ideal for use as a bag since it resists punctures, stains and basic wear. The other advantage to canvas is the fact that since it's naturally water repellent, it doesn't take much work to waterproof it.
Instructions
1. Clean the canvas bag thoroughly both inside and out. Most waterproofing agents will make stains permanent and often encase dirt, making it difficult or impossible to remove.
2. Treat the seams if needed. If the bag has overlapping seams (like on blue jeans) it won't need extra help; but if it has a hidden seam (two panels come together and are stitched inside the bag) it will need special attention. Use a small amount of rubber sealant (like what is used to fix holes in rubber rafts) by running the applicator along the entire seam.
3. Spray a silicone-based waterproofer over the entire outside of the bag. Make sure to spray the entire bag, paying special attention to the seams and the bottom. This process will have to be redone occasionally as the layer of silicone provided by the spray will slowly rub off as the bag is used.
4. Pay attention to any zippers on the bag. No zipper is completely waterproof, but some are much better than others in keeping out water. If you notice water is coming through the zippers on your bag, the best way to deal with it is to tape them down using an acid-free packing tape. This tape will leave little to no residue. For best results the tape will need to be reapplied every time the zipper is used.
Tags: special attention, tape will, will need
