Does Mono Actually Float? (Fluorocarbon vs. Monofilament Contest)


Does mono float or sink?

What about fluorocarbon line?

Does it sink or float?

There’s a lot of misunderstanding in the fishing industry regarding this question, so I decided to do a side-by-side comparison of how fast monofilament sinks (if it does at all) compared to fluorocarbon.

I compared how they do in saltwater and tried several different diameters of fishing line so that my results could be as accurate as possible.

Want to see the results?

Check our newest experiment below.

Fluoro vs. Mono Sink Test [VIDEO]

Sign up for FREE to receive the latest saltwater fishing videos, tutorials, product reviews, and fishing product discounts!

➡ Click here to claim your FREE pack of Slam Shady paddletails

➡ Click here to join the Insider Club

Here are the results of the test:

30 lb Monofilament (Ande): Sink rate of 5.0 seconds

30 lb Fluorocarbon (Vanish): Sink rate of 2.1 seconds

20 lb Monofilament (Berkley): Sink rate of 5.5 seconds

60 lb Fluorocarbon (Seaguar): Sink rate of 1.3 seconds

Here’s what we learned from this experiment:

  1. Monofilament does not float
  2. The diameter of the material matters (thicker line sinks quicker)
  3. Fluorocarbon sinks ~2.5x faster than monofilament. This matters more if you’re using one of these as a main line, but probably not as much if you’re using one of them for just leader material with braided line for your main line.


luke simonds salt strong redfish

Contrary to popular belief, monofilament actually does sink, although it sinks a little slower than fluorocarbon.

Have you found anything different than the results I got?

Let me know in the comments below!

For more experiments like this, you can see all of our fishing line tests here.

And if you know someone who thinks mono floats, please TAG or SHARE this with them!

P.S. Want access to our best fishing spots and tips, plus discounts to our online tackle store? Click here to join us in the Insider Club.

Stop Wasting Time On The Water!

Do what the “SMART ANGLERS” are doing and join the Insider Club.

Here’s what you’ll receive today when you join:

  • Weekly fishing reports and TRENDS revealing exactly where you should fish ever trip
  • Weekly “spot dissection” videos that walk you through all the best spots in your area
  • Exclusive fishing tips from the PROS you can’t find anywhere else
  • Everything you need to start catching fish more consistently (regardless if you fish out of a boat, kayak, or land).

Click here to join today.

Related articles:

Related categories:

Notify of

Inline Feedbacks
View all comments
1 month ago

Do a stretch test next. My experience has been that most fluorocarbon lines stretch just as much as mono.

Last edited 1 month ago by Mike
Jason May
7 months ago

Perfect test!

Ike Johnson
1 year ago

What braided line sinks?

Joe Fishmaga
3 years ago

I fished side by side. Me using mono leader. My partner using floro. He consistently caught more snook. I caught trout. After a year I switched to floro. Immeditly I started catching snook. That’s topwater lures. Free lining shrimp swivels no swivels ect. Snook see mono better. Also I use 6′ leader . He used 4′.

Greg Burris
3 years ago

Flouro more abrasive resistant? Not in my experience. Great article

Lyle Crafton
1 year ago
Reply to  Luke Simonds

Ipso Facto.

3 years ago

Thanks dood! Love these tests you do!

Jeffrey Dudenhefer
4 years ago

Thanks Luke, appreciate the efforts to save us money.

Gerald Dexter
4 years ago

Thanks Luke

Steve Perry
4 years ago

With all due respect, your test is a bit misleading. I’ve got over 20 years fly fishing, mostly freshwater, and believe your premise for the discussion is off. Yes, Mono sinks. Issue is Mono floats much better on the surface of water than does fluorocarbon. The composition allows it to float better. The relative diameter of mono is greater. Having spent 20 years regularly using both, the way to go is if you want your leader on the surface, use Mono. Ginking up mono helps with the floatation as well. Subsurface, use fluoro if you are concerned about abrasion. I nearly always use fluorocarbon at the end of my leader because the diameter is less and it is more abrasion resistant. Believe you did a test on abrasion resistance between the two and I’ll tell you there absolutely is a difference between the two.

4 years ago
Reply to  Luke Simonds

Luke, appreciate the response. Agree that float-ability is mainly important in the fly fishing world. Applies for dry flies as well as when indicators are used. Often times, you can use an indicator and suspend a fly below. Example in salt could be something like a shrimp pattern. Mono will absorb water, which is why most folks will gink up the leader to help it float after a bit of use. My conclusion on fluoro being more abrasion resistant is based on experience. Have fished many areas where mono would get chewed up by bottom structure such as rock, where the fluoro would show minimal wear. Nothing scientific to it, just what has worked. I’m all for using something that’s cheaper if it works, but where there’s a chance of abrasion, I’ll stick with the fluoro at the terminal end personally. I’ve seen the video you did. Just not sure the test is accurate for realistic conditions. Love all the work you all are doing, I’m just in a bit of disagreement when it comes to your presentation of mono vs fluoro.

Durvesh Chury
2 years ago
Reply to  Luke Simonds

Luke love the videos, could you also try the high floating mono such as the sunline FF2?
Designed to float better

David Bates
4 years ago

Why floro vs mono for leader?


Do what the “SMART ANGLERS” are doing and join the Insider Club.

Here’s what you’ll receive today when you join:

Other Fishing Tips You May Like :

Top 3 Lures For Fishing Coastal Marshes (For Redfish, Trout, & Flounder)

Want to know what the best lures for fishing coastal marshes are? See them here, as well as how to rig them and how to use them to catch more fish.
See Full post

Top 3 Shrimp Imitation Lures For Fall & Winter Fishing

What are the best shrimp imitation lures to use for fishing in the fall and winter? Shrimp is one of the main baits during fall and winter...
See Full post

The Mulligan: Engineered So You Catch Fish Others Can’t Reach

We all agree that he or she who can cast the farthest will reach more fish. Now here's a lure that gives you a massive advantage...
See Full post
Would love your thoughts, please comment.x

Get Instant Access To “The Inshore Fishing Manifesto” PDF Now

You’ll automatically be emailed a private link to download your PDF, plus you’ll be added to the Salt Strong Newsletter.
(Please double-check your email below to ensure delivery.)