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★★★★★ Rated 4.8 Based On 5000+ Reviews
Solderstick™ Waterproof Solder Wire Connector Kit
Perfect for Automotive, Marine and Home DIY projects.
IP67 Waterproof
Sealed Performance
Vibration Resistance
UL Certified
IP67 Waterproof
Sealed Performance
Weather Resistance
UL Certified
Saves Time – Faster Than Traditional Soldering
Stronger & More Reliable – Than Crimping
Works with– all wire sizes & types
Perfect for – High-Vibration & High-Performance Wiring
30 Day Money Back Guarantee
Free Worldwide Shipping
24/7 Customer SupportDual-walled polyolefin tubing / Copper
Fits 24 up to 10 AWG
Try Solderstick for 30 days, 100% satisfied or your money back
Try Solderstick for 30 days, 100% satisfied or your money back
Try Solderstick for 30 days, 100% satisfied or your money back
Try Solderstick for 30 days, 100% satisfied or your money back
Made from the highest quality ultra-soft nylon, polyester and cotton.
High-quality, durable and stain-resistant fabric.
Fits up to 127 cm in circumference.
Try the belt free for 30 days, risk-free.
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30 DAY MONEY-BACK GUARANTEE
If you are not satisfied with solderstick™, we offer a 30-day money-back guarantee on all purchases. Simply contact our customer service for a full refund or replacement.
ORDER SUMMARY
TRUSTED CUSTOMER REVIEWS
Lance M.
"This is great for automotive purposes. You get a waterproof connection that is easy to perform and is fully soldered - you just need a lighter. No wire nuts, or shrink tubing - twisting copper and electrical tape. This makes your repair OEM quality. Got the 500pcs kit for a buddy of mine—he’s been wrenching for years and even he’s impressed."
4w
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Solderstick Replied • 18 Replies
Taylor H.
"My husband and I do a lot of DIY around the house with us both having technician experience. We do know how to solder but it's a whole process of busting out the soldering iron and setting everything up so these are a very welcome shortcut, lol. They work really well and are effective at connecting wires while protecting the joint at the same time with the shrink tubing. Pretty worth it if you are looking to save time and eliminate frustration."
4w
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Axel B.
"I used these to re-wire my entire golf cart as I installed new lights, accessories and wiring harnesses and the job went smooth and ended up with very professional results.
A standard heat gun on the low setting was all it took to shrink these down evenly and cleanly every time.
No melting of the wiring or anything else in close proximity."
4w
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Solderstick Replied • 15 Replies
WHY CHOOSE US
30-Day Satisfaction & Money Back Guarantee
If you're not satisfied with your product(s), we'll make it right. That's our promise!
Over 120,468+ Successfully Shipped Orders
We ship our quality products, it's just one of the reasons we have so many happy repeat customers!
AS SEEN ON
★★★★★ Rated 4.8 Based On 5000+ Reviews
People Are Raving About Solderstick
No More Re-Dos!
My trailer lights kept cutting out on bumps. Replaced the bad splice with this and haven’t touched it since - still solid after rain and highway miles.
Alex W.
Tight Space Savior
Worked great under the dash where there’s no room to solder properly. Way cleaner than fighting a soldering iron upside down.
Gabriel T.
Replaced all my tape and crimps!
Pulled out an old taped splice that was corroded. Replaced it with this and it looks factory instead of hacked together.
Tim H.
Winter-Proof Connection
Used these on my plow wiring last season. Snow, salt, freezing temps - connection never failed once.
Daniel G.
People Are Raving About Solderstick
Technical Specification
Min. Shrink Temp
80°C / 176°F
Min. Solder Melting Temp.
138°C / 280°F
Material
Dual-walled polyolefin tubing
Cable/Wire Sizes
White
26-24 AWG | 0.25-0.34mm²
Red
22-16 AWG | 0.5-1.5mm²
Blue
16-12 AWG | 1.5-2.5mm²
Yellow
12-10 AWG | 4-6mm²
Solutions For
Boats
Automobiles
Home Wirings
Audio Systems
Electrical Project
Medical Device Assembly
Audio Systems
Electrical Project
Medical Device Assembly
Boats
Automobiles
Home Wirings
Why Solderstick?
Quick Secure Connections
Perfect for outdoor projects, it keeps your connections safe from moisture and corrosion.
Guaranteed Weatherproof
Its innovative design ensures a secure bond every time, making your projects smooth and efficient.
Easy To Use & Saves Time
Save time and effort with connectors that simplify your tasks without compromising quality.
Enhanced Safety
Reduce burn & hazard risks to ensure a safer working environment, while being 100% safe for electronics.
Fits All Projects
From automotive repairs to home improvements, it’s the go-to solution for any wiring challenge.
Lasting Reliability
With high-quality materials and constru- ction, it delivers reliable connections that stand the test of time.
Quick Secure Connections
Guaranteed Weatherproof
Easy To Use & Saves Time
Enhanced Safety
Fits All Projects
Lasting Reliability
3 Simple Steps To
Seamless Wire Connections
Prep Your Cables
Strip your wire insulation 1/3" on both wire ends & twist the strands together.
Insert & Connect
Use SolderStick Sleeve to connect the wires together with the right connector size.
Heat To Seal
Apply heat with a heat gun, lighter or blow dryer while continuously rotating the wire.
No Guesswork :
Find The Right Size Fast
With our color-coded tubing, picking the right connector for any job is a breeze. Just match your wire to the chart on the box—quick match, no hassle.
You've Done This Before
You'll spend Saturday afternoon fixing those trailer lights. Crimp the connectors, wrap them in tape, test everything. Lights work. Job done.
Three months later, you're back under there with a voltmeter, chasing the same damn problem.
The crimp worked loose. Moisture got in. Now you're doing it all over again.
And it's not just annoying - it's embarrassing. Your buddy sees you on the side of the road, trailer lights out again. Your wife asks "Didn't you just fix that?"
You know the right way to do it. A proper solder joint with a waterproof seal. The way mechanics charge $100/hour to do.
But who has time to break out the soldering iron, apply flux without making a mess, and spend 10 minutes per connection?
There's a reason you keep reaching for crimp connectors. They're fast.
They're just not permanent.
The Only Connector That Actually Holds
Wire Crimp
Electrical Tape
IP67 WATERPROOF
VIBRATION RESISTANT
TIME SAVING
NO TOOLS NEEDED
PERMANENT
PROFESSIONAL RESULTS
  |  Wire Crimp |  Electrical Tape | |
|---|---|---|---|
| IP67 Waterproof |  |  | |
| Strong And Safe Connection | | | |
| Permanent Solution | | | |
| Marine & Automobile Approved | | | |
| Clean And Tidy Wiring | | | |
Recommended By Experts, Pros & DIYers
Our products are backed and used by professionals all around the world.
Robby Layton
524K subscribers
The Bearded Mechanic
627K subscribers
Born Again Boating
289K subscribers
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How SolderStick Works
3-in-1 Technology
1. High-Strength Low-Temp Solder
Not the cheap eutectic crap that cracks under stress. Our copper-core solder alloy melts at just 138°C (low enough to not damage wire insulation) but creates bonds that exceed crimped connection strength by 40%.
2. Dual-Wall Military-Grade Polyolefin
Automotive OEM-spec tubing that shrinks at 80°C to create an IP67 waterproof seal. We're talking fully submersible - the same standard used for underwater electronics.
Tested in saltwater for 6 months. Zero corrosion. Zero moisture ingress.
3. Hot-Melt Adhesive Lining
This is what separates SolderStick from traditional solder joints that crack under vibration. When heated, the adhesive flows between wire strands, creating a flexible strain-relief bond that moves with vibration instead of fighting it.
50,000+ DIYers Have Already Made The Switch
Rated 4.9/5 by 50,000+ satisfied customers
"Never going back to crimp connectors"
I've had enough crimp connectors fail on me over the years that I don't trust them anymore. Used SolderStick on my entire boat rewire last spring - 6 months in saltwater, not a single issue. These things are bulletproof. Already recommended them to three guys at the marina
Mark T.
" My trailer lights actually work now"
I was so skeptical. Bought them anyway because I was desperate after my 4th time re-wiring trailer lights. Holy shit these actually work. Been through mud, rain, 8,000 miles of highway driving. Lights still perfect. I'm going back and replacing every crimp connection on my truck now.
Dave H.
"Easier than I expected"
Took my boat to a marine electrician who charged $380 to 'fix' my nav lights. Six weeks later, same problem. Did it myself with SolderStick for under $40. Two years later - still perfect. Should've done it myself the first time.
Carlos M.
Complete Technical Specifications
Applications
Boats
Audio Systems
Automobiles
Electrical Project
Home Wirings
Medical Device Assembly
Technical Specification
Minimum Shrink Temp.
80°C / 176°F
Minimum Solder Melting Temp.
138°C / 280°F
Material
Dual-walled polyolefin tubing / Copper
Cable/Wire Sizes
White:
26-24 AWG / 0.25-0.34mm2
Red:
22-16 AWG / 0.5-1.5mm2
Blue:
16-12 AWG / 1.5-2.5mm2
Yellow:
12-10 AWG / 4-6mm2
3 Steps To Permanent Connections
Step 1: Insert Wires
Strip wires and push into connector until they reach the solder ring.
Step 2: Apply Heat
Heat with heat gun and watch the tube shrink and the solder flow
Step 3: Cool & Done
Let it cool for 30 seconds. Pull-test it. It's not going anywhere. Ever.
30-Day Money-Back Guarantee
We've shipped over 500,000 connectors. Our return rate is under 1%.
Here's the deal: Use SolderStick on your next wiring project. If you're not convinced these are the best wire connectors you've ever used, email us within 30 days. We'll refund every penny.
No hoops. No forms. No BS.
We're this confident because we know you won't send them back.
Special Offer Right Now!
Try Solderstick risk-free NOW at a record-low price!
$300
$149.99
SAVE 50% OFF
Order now and get:
50% discount - Biggest sale we've ever run
30-day money-back guarantee - Zero risk
FREE Organiser box
Free shipping - No hidden fees
Stock alert: Running low due to surge from mechanic YouTubers recommending us. Order now to guarantee availability.
FREQUENTLY ASKED QUESTIONS
Yes. Your standard heat gun on medium heat is all you need. Takes about 10-15 seconds per connection. No crimping tools, no separate soldering - just heat and you're done.
100% waterproof with an IP67 rating. The adhesive-lined tubing creates a permanent seal that handles submersion, salt spray, engine fluids - whatever you throw at it. We've had customers report connections still solid after years underwater in bilge areas.
Because they actually work. One failed connection costs you more in time and frustration than our entire kit. These are permanent fixes, not temporary patches. Most customers say they'll never go back to crimps.
White: 26-24 AWG (tiny gauge - electronics, sensors, small LEDs)
Red: 22-16 AWG (light duty - LED lights, switches, small accessories)
Blue: 16-12 AWG (most automotive - stereos, power accessories, auxiliary lights)
Yellow: 12-10 AWG (heavy duty - winches, main power feeds, large pumps)
You can in a pinch, but a heat gun gives better control. Too much direct flame can burn through the tubing. If you must use a torch, keep it moving and use the outer edge of the flame.
Orders placed before 2 PM ship same day. Most customers get their SolderSticks within 3-5 business days. We know when you need these, you need them now.
Still have questions? Our support team includes actual electricians and mechanics who use SolderStick daily. Email support@solderstick.com. We're here Monday-Friday, 8 AM - 6 PM CST.
4.8 stars
Average customer rating
Waterproof performance: 4.8
Easy to use: 4.9
Long-term reliability: 4.8
Value for money: 4.8
EXTENSIVE CUSTOMER TESTIMONIALS
I have many years of experience in automotive and this is by far the easiest solder tool I've yet to use. Simply cut the wires, strip them of the plastic and joint them in the connector. I used a simple heat gun and with 30 seconds I was done. I measured the wire before the repair and got .3 ohms after the repair I measured again and got .2 ohms I pulled on the wires with lots of pressure and they wouldn't let go. Great product!!!
HVAC tech for 35 years. These remind me of the military-spec connectors we used to get, but way easier to find. Just rewired my whole shop's 12V LED system with these. What used to take hours with traditional soldering now takes minutes. The built-in flux is genius. Ordered 3 more packs.
Retired electrician here. Was skeptical at first because I've tried the cheap knockoffs before. But SolderStick actually works like it should. Used them on my RV's converter wiring and my son's truck stereo install. Clean connections every time. The solder flows evenly and the seal is watertight. Worth every penny for the peace of mind.
They work fine for what they are. Used them on my motorcycle's accessory wiring. Main complaint is you can't really inspect the solder joint after it's done like you can with a regular solder connection. Also melted through one trying to use a lighter (my bad). Stick with a proper heat gun. Good for tight spaces though.
This heat shrink solder seal set is brilliant! I’ve used them in my off-road lighting installations on my truck and today, used them to repair the battery connection to my trucks alarm system. This is my go to soldering solution. Highly recommend for anyone that needs to make a seamless soldering connection that self seals with the heat of a pocket lighter or heat gun.
If you've ever chased down a bad connection in a vehicle harness, you know the pain. These eliminate that problem. Used them fixing the tail lights on my utility trailer - the crimps kept failing from all the vibration. 2 years later, zero issues. Also used them on my ATV winch wiring. Pro tip: clean your wires good first.
Every year it's the same story - trailer lights work fine, then they don't. Always traced back to corroded crimps. Switched to these SolderSticks last season. Pulled my boat from Texas to Minnesota twice, through rain and salt. Lights work perfect. Even held up when I accidentally submerged the trailer too deep at the ramp.
I used a mess of these in doing a recent car audio install. These are ideal for secure butt splices. The internal solder and sealing shrink made confident connections when installed properly. Confidence in connections after install are very important. The kit had a good variety and quantity of sizes with an ok case. You'll want a mini heat gun to use these.
18624 More Reviews
Frequently Asked Questions
Over 100,000 kits sold and trusted by pros across the USA—SolderStick delivers faster, cleaner, and more reliable connections without tools or crimping. Waterproof, vibration-proof, and built to last, it’s the go-to choice for serious mechanics and DIYers.
Yes. Crimping requires tools and can loosen over time. Electrical tape often peels or fails under heat. SolderStick fuses wires with solder and seals them watertight with dual-wall tubing, ensuring a long-lasting bond.
No. All you need is a heat source—like a heat gun or even a lighter. It’s plug-and-play for any skill level.
Absolutely. SolderStick is IP67 waterproof, vibration-resistant, and UL/SGS certified—ideal for cars, trucks, boats, and off-road setups.
SolderStick connectors come in multiple sizes, color-coded for AWG 10–26. Kits include a variety so you're ready for any project.
Yes. SolderStick uses high-purity SolderFlux™ that melts clean and evenly with standard heat tools—no cold joints or guesswork.
We stand by our product with a 30-day money-back guarantee. If you're not satisfied, just reach out and we'll make it right.
We offer expedited shipping from our U.S. warehouse, and most orders arrive within 3–6 business days. We ship nationwide across the USA.
Empfohlen von
Experten, Profis und Heimwerker
Unsere Produkte werden von Fachleuten auf der ganzen Welt unterstützt und verwendet.
Robby Layton
Der bärtige Mechaniker
Wiedergeborenes Bootfahren
Schneller Verkauf: 43 Kits in der letzten Stunde verkauft
30 Tage Geld-zurück-Garantie
Frequently Asked Questions
This is where all the answers to your questions are.
No. You don’t need crimpers or a soldering iron. A standard heat gun works best, but many customers successfully use a hair dryer or lighter in a pinch. That’s part of what makes these so convenient.
It’s both. Once heated, the solder bonds the wires together while the heat-shrink tubing seals everything in place. The result feels solid immediately and doesn’t loosen when handled or vibrated.
Yes. The tubing shrinks tightly around the wire and creates a sealed joint that helps keep moisture out. Many customers use these on trailers, boats, and outdoor wiring without issues.
That’s a common concern, but these are designed so the solder melts at the right temperature before the tubing degrades. As long as you apply steady heat and don’t rush it, everything activates as intended.
Absolutely. These are commonly used for vehicle repairs, trailers, boats, and other environments where vibration and moisture are a problem. Customers often switch to these after crimps fail.
They come in multiple sizes to match common wire gauges from 10-26AWG or 0.25-5mm². As long as you choose the correct size for your wire, the connection will shrink down tightly and hold properly.
Delivery typically takes 3–5 business days for orders within the USA and 5-10 business days for international orders.
Most customers receive their order within a week, and you’ll get a tracking number as soon as it ships so you can follow it every step of the way.
We want you to feel completely confident trying this.
If you’re not satisfied for any reason, you’re protected by our 30-day money-back guarantee.
Here’s how it works:
You have 30 days from the date your order is delivered to request a refund
Simply contact our support team with your order number
We’ll guide you through the return process step by step
Once your return is received and inspected, your refund will be issued back to your original payment method.
If your order arrived damaged, defective, or incorrect, we’ll take care of it right away — no hassle.
We stand behind our product and believe the best way to earn trust is to make sure you’re never stuck with something you’re unhappy with.
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Why 50,000 Customers Love SolderStick
Michael
I used these to fix a wiring issue on my trailer, and they worked way better than the crimp connectors I usually fight with. Once the solder melted and the tubing shrank, the joint felt solid right away instead of loose and questionable.
Stanley
I was honestly skeptical at first, but after using a few of these I’m sold. The solder flowed cleanly and the heat shrink sealed everything tight. It didn’t move at all when I tugged on the wires afterward.
Fred
This is the perfect solution to splicing wires. You strip the ends of the wires to be spliced, put the ends into the tube and then run the hair dryer to heat up and activate the bead of solder inside the tube and shrink the plastic ends to form a splice that will not fall apart the second you release the joint.
Ryan
Used these on some automotive wiring and they saved me a lot of frustration. Once the solder melted and the ends shrank down, the splice stayed together and didn’t feel flimsy like tape or crimps usually do.
William
After years of using tape and crimps, this felt like a more permanent solution. It didn’t feel temporary or “good enough.” It felt finished.
Customer Service Hours
9am - 6pm PST
Monday - Friday
support@solderstick.com