If you've ever struggled to keep fabric layers aligned while sewing, especially with marine materials,
Seamstick might become one of your favorite tools in the shop.
Seamstick is a double-sided seaming tape with an acrylic adhesive on a Mylar backing.
In simple terms, it is designed to temporarily hold fabric together so you can sew clean,
accurate seams without shifting, slipping, or frustration.
Which Seamstick Size Should You Use?
3/8" Seamstick
- Best overall choice for most jobs
- Great for marine canvas work
- Useful for sailmaking and repairs
- Good for seams, panels, and reinforcements
Specialty Sizes
- 1/4" for zippers and vinyl-to-vinyl work
- 3/4" for overlapped seams
- Choose based on seam width and control needed
- Match the tape to the type of sewing you're doing
In our shop, 3/8" is the go-to size for most applications.
Why Seamstick Is So Useful
Seamstick solves one of the biggest challenges in sewing heavy or slippery materials by helping keep everything
exactly where you want it while sewing.
That matters when you're working with long seams, multiple panels, zippers, clear vinyl, patches,
reinforcements, or bulky marine materials that tend to move during assembly.
For marine canvas and sailmaking work, Seamstick is one of the simplest ways to improve seam accuracy, reduce shifting, and make sewing easier.
- Keeps layers aligned
- Reduces the need for pinning
- Speeds up sewing and assembly
- Improves stitch accuracy
Seamstick vs Pins vs Glue
One of the biggest advantages of Seamstick is that it gives you temporary holding power without the drawbacks
of pins or messy adhesives.
Seamstick
- No pin holes in fabric
- Fast and easy to apply
- Excellent for vinyl and clear materials
- Ideal for marine canvas and sailmaking
Pins or Glue
- Pins can damage or mark some materials
- Glue can be messy and permanent
- Slower on large panels and long seams
- Often less convenient in real shop use
If you want cleaner setup and faster sewing, Seamstick is usually the more practical choice.
How to Use Seamstick
For Overlapped Seams
When joining two fabric panels, apply 3/4" Seamstick to the selvage edge of one panel.
Stick the second panel to the first, using the inside edge of the Seamstick as a guide for a clean, even seam.
Sew along the edge of the top panel, flip the work over, and sew along the other side.
This is a great technique when joining two widths of Sunbrella® to create a wider finished panel.
For Sailcloth
Seamstick is essential when sewing sailcloth. Use 3/8" Seamstick in the seam allowance of the lower panel,
then position the next panel on top before sewing.
- Patches
- Luff tape
- Webbing
- Other reinforcements
For Zippers
Use 1/4" Seamstick to hold zippers in place while sewing.
It helps keep alignment straight and prevents shifting while you work.
For Clear Vinyl and Enclosure Panels
Seamstick is incredibly useful when making enclosure panels or replacing clear vinyl window material in dodgers and enclosures.
Use it to stick fabric to clear vinyl, or to position new vinyl onto an existing panel before sewing.
When replacing clear vinyl, sew the new piece in place first and then cut out the old window material afterward.
That helps preserve the original shape of the panel.
For Vinyl-to-Vinyl Applications
Seamstick sticks exceptionally well to vinyl. When bonding vinyl to vinyl, we prefer using 1/4" Seamstick for better control.
If you place it incorrectly, Goo Gone can help remove excess adhesive residue from the vinyl.
For Reinforcements and Finishing
Use Seamstick to attach vinyl laminate cloth to the inside of hatch covers, dodgers, and other projects
as reinforcement for fasteners or to help finish an edge cleanly before sewing.
Tips for Best Results
A few simple habits can make Seamstick work even better and help you avoid problems during sewing.
Application Tips
- Do not stretch the tape while applying it
- Lay fabric flat before application
- Press it down firmly for better adhesion
- Choose the width that matches the job
Good to Know
- Stretching the tape can cause puckering later
- A hard metal object can help press it down
- Use heat carefully to avoid damaging fabric
- Older Sunbrella® may accept adhesion better than brand-new fabric
If the tape is not sticking as well as you'd like, press it down with a hard metal object,
such as the handle of a pair of shears.
You can also use a warm iron, but be careful not to overheat the material.
Too much heat can damage or melt certain fabrics.
Frequently Asked Questions
What is Seamstick?
Seamstick is a double-sided seaming tape, also called basting tape, used to temporarily hold materials together before sewing.
What size Seamstick should I use?
For most projects, 3/8" is the best all-around choice. Use 1/4" for zippers and vinyl work, and 3/4" for overlapped seams.
Can Seamstick be used on sailcloth?
Yes. Seamstick is very useful for sailcloth seams, patches, luff tape, webbing, and other reinforcements.
Can Seamstick be used with clear vinyl?
Yes. It works very well for enclosure panels, dodgers, and clear window replacement where alignment matters.
Is Seamstick the same as basting tape?
In most marine sewing and sailmaking contexts, yes. Seamstick is a type of basting tape used to hold materials in place before sewing.
Final Thoughts
Seamstick is one of those simple tools that makes a huge difference in both sailmaking and marine canvas work.
It helps reduce frustration, improves accuracy, and saves time on nearly every project.
- Choose 3/8" Seamstick for the best all-around performance
- Choose 1/4" Seamstick for zippers and vinyl detail work
- Choose 3/4" Seamstick for overlapped seams and wider joins
- Use it whenever accurate alignment matters before sewing
Once you start using it, it quickly becomes one of those tools you never want to be without.
Need Seamstick for Your Next Project?
Whether you're sewing sails, marine canvas, zippers, or enclosure panels,
Sailmaker's Supply can help you choose the right Seamstick for the work you actually do.
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