Care & Maintenance

Best Waterproofing Sprays for Different Fabrics

For Technical Jackets (Gore-Tex, eVent, etc.)

Use a spray-on DWR that is PFC-free if possible. Nikwax TX.Direct Spray-On (€14 for 300 ml at Decathlon) is a reliable choice. It reactivates the factory DWR and is safe for all breathable membranes. Grangers Performance Repel Plus (€16 for 275 ml) is another top pick, offering excellent water beading and durability. Apply after cleaning the jacket with a tech wash like Nikwax Tech Wash.

For Rucksacks and Backpacks

Rucksacks, especially military surplus like the Spanish petate or civilian packs, benefit from a spray-on DWR. ReviveX Pro Cleaner & DWR (€22 for 355 ml) is a two-in-one that cleans and waterproofs. For a budget option, Atsko Silicone Water-Guard (€10 for 340 g) works well on nylon and polyester. Be sure to mask off the back panel and hip belt for comfort. For more on choosing a rucksack, see our guide to best military rucksacks in Spain.

For Tents and Tarps

Tents require a different approach. Use a silicone-based spray or sealer for the flysheet and a seam sealer for the seams. Gear Aid Silicone Tent Sealer (€18 for 4 oz) is specifically for silicone-coated nylon. For polyurethane-coated tents, McNett Seam Grip (€12 for 1 oz) works well. To restore the entire fly, Nikwax Tent & Gear SolarProof (€17 for 300 ml) adds UV protection and water repellency.

For Canvas and Waxed Cotton

Canvas military jackets and bags, like the Spanish casaca, are traditionally waxed. Barbour Thornproof Dressing (€30 for 200 g) is the gold standard. Apply by melting the wax and brushing it onto clean fabric, then heat with a hairdryer to set. Otter Wax Fabric Wax (€15 for 3.5 oz) is a great alternative, available at outdoor stores like Barrabes. For more on military jackets, see best military jackets in Spain.

How to Waterproof Gear: Step-by-Step Methods

Method 1: Spray-on DWR for Jackets

1. Clean the jacket: Wash with a tech wash (e.g., Nikwax Tech Wash) to remove dirt and oils. Rinse thoroughly.
2. Dampen the fabric: Spray the jacket while it's still damp (not soaking wet). This helps the DWR spread evenly.
3. Apply the spray: Hold the can 15-20 cm from the fabric. Spray in a sweeping motion, covering all outer surfaces. Pay attention to shoulders, hood, and cuffs.
4. Set the treatment: Follow product instructions. Some require heat activation (tumble dry on low or use a hairdryer). For Nikwax, no heat is needed—just let it dry.
5. Test: Sprinkle water on the fabric. If it beads up, you're good. If not, apply a second coat.

Method 2: Waxing a Canvas Jacket

1. Clean the jacket: Brush off loose dirt and spot-clean with mild soap. Let it dry completely.
2. Warm the wax: Use a hairdryer or place the tin in hot water to soften the wax.
3. Apply wax: Use a lint-free cloth or brush to apply a thin, even layer. Work in sections.
4. Heat set: Use a hairdryer on medium heat to melt the wax into the fabric. The jacket will darken and become more water-resistant.
5. Buff excess: Wipe off any excess wax with a clean cloth. Let it cure for 24 hours.

Method 3: Sealing Tent Seams

1. Set up the tent: Pitch it indoors or on a dry day. Clean the seams with alcohol to remove residue.
2. Apply seam sealer: Use a small brush or applicator to apply a thin bead along the seam. Avoid getting it on the fabric.
3. Let dry: Allow 12-24 hours for full cure. For silicone-coated tents, use a silicone-specific sealer.

Best Waterproofing Products Compared

When to Reapply Waterproofing

Signs that your gear needs re-waterproofing:

• Water soaks in: Instead of beading, water darkens the fabric.
• Wet-out spots: Shoulders, hood, and back show dampness.
• Reduced breathability: You feel clammy inside your jacket.
• After washing: Detergent strips DWR, so reapply every 2-3 washes.

For heavy-use items like a military petate, you may need to treat it before each multi-day trip. For occasional use, once a year is sufficient.

Common Mistakes to Avoid

• Using fabric softener: It destroys DWR. Always use tech wash.
• Over-spraying: Too much product can clog breathable membranes. Follow instructions.
• Skipping cleaning: Dirt prevents DWR from bonding. Always clean first.
• Ignoring seams: Even with DWR, water can enter through unsealed seams. Use seam sealer.
• Drying in direct sunlight: UV degrades DWR. Dry in shade or indoors.

Special Considerations for Military Gear

Spanish military surplus, such as the casaca field jacket or petate rucksack, often uses cotton or nylon blends. For cotton, wax is ideal. For nylon, use a silicone or DWR spray. If you're importing gear from abroad, check import laws to ensure compliance. Also, note that some vintage gear may have original coatings that are now degraded; stripping and reapplying is best.

For those who wear camouflage, be aware that some DWR sprays can alter the fabric's appearance slightly. Test on a hidden area first. For legal considerations on wearing camouflage in Spain, see our article on camouflage legality.

Eco-Friendly Options

Many modern DWR sprays contain perfluorinated chemicals (PFCs) which persist in the environment. Look for PFC-free options like Nikwax TX.Direct (PFC-free) or Grangers Eco Repel. These use plant-based polymers and are biodegradable. Prices are similar to conventional products.

Conclusion

Waterproofing your fabric gear extends its life and keeps you comfortable in wet conditions. Choose the right product for your fabric type, clean thoroughly before application, and reapply as needed. With proper care, your jacket, rucksack, and tent will perform reliably for years. For more gear maintenance tips, explore our related articles below.

Related articles

• The Complete Guide to Buying Spanish Military Gear Online
• Best Military Rucksacks in Spain
• Best Military Jackets in Spain
• Petate vs Civilian Backpack: Which is Better?
• Is It Legal to Wear Camouflage in Spain?