Canvas Repair: Restitching Seams, Zippers & More

In the third and final post of our canvas repair series, we’re going to look at how to restitch seams, and how to replace old, failing zippers and hook and loop on your boat canvas. Simple repairs like these can keep your cover in good working order for years to come. Be sure to catch up on the first two parts of this series where we discussed patching rips and tears, and replacing snaps and grommets.

Seams

Thread rots faster in the sun than most cover fabrics do, so you can often get several more years out of your canvas by restitching the seams when they fail. When thread gets old and rotted, it will start to disintegrate. A good way to test the strength of your stitching is to gently pick at the thread with your finger. If the thread starts to fall apart at your touch, you should restitch.

If your cover is fairly new and you want to really prolong its life, you can use a lifetime thread like Tenara® to restitch your seams. Tenara can be tricky to sew with, but it will likely outlast your canvas. In most cases, a UV-treated Tex 90 polyester thread will be a great choice. This thread is the standard for outdoor covers and is treated to be resistant to UV rays.

When you go to resew the seams and hems, you don’t need to rip out the old thread — just sew right over it. Since you will have a large bulk of fabric to maneuver around your sewing machine, be careful to not get extra fabric caught under the foot.

Zippers

If your covers and enclosures have zippers that are failing, they can also be replaced to extend the life of the cover. Zippers will rot over time with strong exposure to UV rays. A zipper is at the end of its life when it starts to fall apart or frequently pops open on its own.

If the zipper is easily removable, rip out the seams holding the zipper and sew a new zipper in its place. If the zipper is in an assembly where it is surrounded by binding and other elements that would require a lot of deconstruction, just cut the zipper out as close to the canvas as possible and then install a new one.

Hook & Loop

This common product can be a really handy fastener around boats, but it can quickly fail if it’s not properly protected from the sun. If you have some hook and loop that is just not as sticky as it used to be, you can easily replace it. To do this, simply rip out the seams holding the old hook and loop to the canvas. Then you can sew the new product in its place!

The back side of hook and loop should always be protected from the sun. If yours was not backed with canvas, we recommend adding a canvas flap for it during the replacement process. To accomplish this, cut a piece of canvas a little bigger than the hook-and-loop tape and sew the product to it. Then sew the canvas to the rest of the cover to prolong the life of your hook and loop.

This concludes our canvas repair series. Did we cover your questions? If you have questions on your canvas repair job, ask us in the comments and we’ll do our best to help!