When making or repairing outdoor equipment, choosing the right thread is just as important as selecting the fabric itself. Whether you're sewing a tent, waterproof jacket, boat cover or outdoor bag, you need stitching that's strong, durable and able to withstand the conditions your finished project will face.

But does waterproof fabric need special waterproof thread? And will using the right thread stop water getting through your seams?

Here's what you need to know before starting your next project.

Do You Need Waterproof Thread for Waterproof Fabric?

Not necessarily. While waterproof fabrics are designed to prevent water from passing through, the thread used to sew them doesn't always need to be waterproof.

What's more important is choosing a thread that can withstand moisture, wear and exposure to the elements without losing its strength.

For most outdoor sewing projects, polyester thread is an excellent choice. It's strong, durable and resistant to moisture, making it suitable for everything from lightweight waterproof clothing to heavier outdoor equipment.

However, different projects place different demands on their stitching, so it's worth understanding the options available.

What Are the Best Threads for Waterproof Fabrics?

Polyester Thread

Polyester is one of the most versatile threads for sewing waterproof fabrics. It offers good strength and durability, doesn't absorb much moisture and is suitable for a wide range of applications.

It's a practical choice for waterproof jackets, outdoor bags, lightweight covers and other items that may regularly get wet.

Bonded Polyester Thread

For heavier fabrics and more demanding applications, bonded polyester thread can be a better option.

This thread has a protective bonding treatment that helps prevent the individual fibres from separating or fraying during sewing.

It's particularly useful for projects such as boat covers, awnings, heavy-duty bags and outdoor upholstery, where seams may experience greater strain.

UV-Resistant Thread

If your finished project will spend long periods outdoors, sunlight is another important consideration.

Prolonged UV exposure can gradually weaken some sewing threads, even when the fabric itself remains in good condition.

Specialist UV-resistant threads are designed to withstand extended sunlight exposure, making them worth considering for marine applications, outdoor covers and equipment that's regularly left outside.

Does Waterproof Thread Make Seams Waterproof?

This is an important distinction. Even if you're using water-resistant thread, it doesn't automatically mean your finished seams will be waterproof.

Every time a needle passes through waterproof fabric, it creates a small hole. Although these holes may be tiny, they can allow water to penetrate, particularly during heavy rain or prolonged exposure.

For projects where waterproofing is essential, such as tents, waterproof clothing or protective covers, you may need to seal the seams after sewing.

Depending on the fabric and its coating, this could involve using a suitable seam sealing tape or liquid seam sealant.

Always check that your chosen sealing product is compatible with the fabric you're working with.

Tips for Sewing Waterproof Fabrics

Alongside choosing the right thread, a few simple considerations can help you achieve a better result.

Match your thread to your fabric. Lightweight waterproof fabrics generally require finer thread, while heavier materials may benefit from something stronger.

Choose the correct needle. Your needle should be suitable for both the fabric and thread. An unnecessarily large needle can create bigger holes in the material.

Avoid unnecessary stitching. Every needle hole creates another potential point for water to enter, so plan your seams carefully and avoid repeatedly unpicking and resewing them.

Test before you start. Try your chosen thread, needle and stitch settings on a spare piece of fabric to check the results before working on your finished project.

Find the Right Thread at Point North Profabrics

Whether you're making outdoor clothing, repairing camping equipment or creating a custom cover, choosing the right combination of fabric and thread will help your project stand up to regular use.

At Point North Profabrics, we supply sewing threads, waterproof fabrics and accessories for a wide range of outdoor sewing projects.

Explore our range online, or contact our team if you need help choosing suitable materials for your next project.