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Better Boat Butyl Tape, RV and Marine Window Seal Kit

Curated from 122 real Reddit conversations

Refreshed on: March 22, 2025

Better Boat Butyl Tape, RV and Marine Window Seal Kit

Brand: Better Boat

Price: $19

Snoop Score:

8.8

Sentiment

8.6

Popularity

9.2

Technical

8.8

Buy on Amazon for $19 See All Butyl Tape Reviews

As an Amazon Associate, I earn from qualifying purchases.

Snoop's Take

The Butyl Tape by Better Boat is a versatile sealing solution specifically designed for RVs and marine applications. This double-sided putty tape is ideal for sealing windows, roofs, and other outdoor installations to prevent leaks and moisture intrusion. Consumer feedback highlights its ease of use, with many users stating, "Worked great, no leaks, and easy to use." Users appreciate its strong water resistance and ability to seal irregular gaps effectively, often mentioning that it creates a "watertight flexible seal that lasts decades." Despite some concerns about potential moisture trapping and application challenges, the overall sentiment leans positive, indicating satisfaction with the product's performance. Based on user reviews and feedback, the Butyl Tape by Better Boat is highly recommended for anyone seeking a reliable sealing solution for their RV or marine needs. Its effectiveness in preventing leaks and its user-friendly application process make it a top choice in its category.

Not for you? Check out our other rated Butyl Tape

Joist tape…overkill or worth it?
Positive Feedback

I just can't see this being the case.
Negative Feedback

8.8

Better Boat Butyl Tape, RV and Marine Window Seal Kit

Buy on Amazon for $19

RV and Trailer Sealing

9 / 10

Automotive Repairs

9 / 10

Marine Applications

9 / 10

Construction and Home Improvement

9 / 10

See how this compares to all Butyl Tape

What it does well!

Key strengths users can’t stop talking about.

Easy to use for sealing

“Joist tape…overkill or worth it?”➕

“I see this asked a lot on here and I've given detailed answers. Without sounding like a dick, why no”➕

“I only ride outdoors 1-2x/week. Which system is better, Tubeless, TPU, Butyl? Triban RC520 Stock whe”➕

“I feel the answer for you is to run butyl tubes with the best tyres you can afford, and get yourself”➕

Provides strong water resistance

“So my joists stay dry. Otherwise it would get wet. Every day.”➕

“they are not set and forget either, and have their own maintenance needs (sealant/large punctures)”➕

Effective for irregular gaps

“I'd say that pretty pretty hard to do since it just goes on the top of the joist.”➕

“I prefer tubeless because most flats fix themselves.”➕

Effective for sealing irregular gaps

“They're leading to mildew, damp spots, ruined bedsheets and a pain in the ass.”➕

“STEP AWAY FROM THE 5200 AND PUT THE TUBE DOWN!”➕

“Butyl tape is the one true way.”➕

“It will stick to both parts you are working with and seal.”➕

Strong waterproof qualities

“Good quality butyl tape is really nice stuff but I’d be just as likely to use 291.”➕

Reliable performance for sealing

“done right, butyl tape NEVER fails and parts can be easily removed.”➕

“I would second butyl tape. East to install and clean up.”➕

“I’ve managed to never use anything else in 2 years cruising full time.”➕

Effective for sealing deck penetrations

“I've heard butyl tape works well.”➕

“I'll give the tape a try.”➕

Recommended for tricky woods like teak

“Try the tape baby.”➕

Effective sealing for RV installations

“been going strong for over 4 years now with no leaks.”➕

“Never had a leak.”➕

“just building up the nerve to go against every instinct and cut a hole in the top of a $25k vehicle. lol”➕

Long-lasting performance with no leaks

“1 year so far with no problems.”➕

Easy application process

“Don’t overthink this one. It’s cake.”➕

Quality butyl tape enhances life of installations

“You will have to check the dicor every year to make sure there are no cracks forming.”➕

Effective for sealing around fasteners

“When bedding the wood ends I’m assuming I use the butyl tape both between the wood block and the cabin top.”➕

“Butyl tape is preferred over 5200 because it is removable when needed and is better at preventing leaks since it will flex better and re-heal.”➕

Works great for re-bedding applications

“Butyl tape works great but also consider "potting" the holes for the mounting screws if the deck is cored.”➕

Creates a watertight flexible seal

“it makes a watertight flexible seal that lasts decades.”➕

Preferred for fan installs

“Butyl tape is the absolute best thing for fan installs.”➕

Reliable sealing performance for re-bedding

“Has anyone used butyl tape to seal deck fixtures?”➕

“I've been very pleased with it. No leaks so far, easy to clean up excess.”➕

Recommended by experienced users

“I've decided on butyl tape based on some recommendations from friends more skilled than I.”➕

Where it needs some work!

Areas to watch—feedback on possible improvements.

Can trap moisture leading to rot

“I just can't see this being the case.”➕

“Cos your adding a membrane that will delamination over time and get trapped moisture inside to fester.”➕

May be considered overkill

“Yup. Doesn't have to be overkill OR worth it, can be both.”➕

Difficult to clean off surfaces

“It isn't the nicest to clean off a curved edge (it took a lot of goof off and scraping).”➕

Can leak if not applied correctly

“I had to rebed traveller halfway through a trip because it started leaking.”➕

Concerns about potential squeezing out

“I might worry about butyl squeezing out from the weight of the rudder.”➕

Can be challenging to find quality tape

“I hear using a quality tape makes life a lot easier.”➕

Concerns about achieving a proper seal

“I think roof tar would do a better job of creating a seal. (I'm not confident that the butyl achieved a seal.)”➕

Can cause streaking on surfaces

“they both cause streaking, rain leaves streak marks on my white paint.”➕

Compare On All Talked About Dimensions

Product Name	Price	Score	See Details	Buy Now
Crawl Space DIY Butyl Sealant Tape	$39	9.8	Details	Buy
Better Boat Butyl Tape, RV and Marine Window Seal Kit	$19	8.8	Details	Buy
XFasten Butyl Sealing Tape	$15	8.7	Details	Buy
Second Skin Butyl Sealant Tape	$23	8.4	Details	Buy
TZGP Butyl Rubber Sealant Tape	$7	7.9	Details	Buy
TAGLLY Butyl Sealant Tape - 13Ft Butyl Rubber Sealant	$9	7.3	Details	Buy
Rvhouse Butyl Tape White 1” x 30 Ft	$13	7.2	Details	Buy
XFasten Butyl Tape Black, 1/2 in x 30 ft x 1/8 in	$13	7.1	Details	Buy
Hanotic Joist Tape for Decking	$48	7.0	Details	Buy
JOAPRIL Butyl Adhesive Tape 2x50'	$85	6.5	Details	Buy
Dicor BT-1834-1 Butyl Seal Tape	$13	5.6	Details	Buy
ZOOFOX 2 Pack Butyl Seal Tape	$19	5.3	Details	Buy
GSSI Sealants Butyl Tape 1/8" x 1" x 100'	$34	5.3	Details	Buy
ELK Butyl Seal Tape - 1 Inch x 50 Feet	$29	5.1	Details	Buy
YankMooM Butyl Tape - Waterproof Sealant Tape	$7	5.0	Details	Buy
Akexermu Butyl Sealant Tape	$12	4.4	Details	Buy
ATack Black Butyl Seal Tape	$13	4.4	Details	Buy
Typar Butyl Flashing Tape - 4" W x 75' L	$25	4.0	Details	Buy
Stacool 13FT Car Headlight Sealant Butyl Tape	$8	3.1	Details	Buy
Oleitodh 4 Rolls Butyl Sealant Tape	$32	3.0	Details	Buy
LLPT Butyl Tape White 1 Inch x 33Ft	$13	2.5	Details	Buy
TAPEBEAR Butyl Tape Waterproof Sealing Tape	$19	1.0	Details	Buy
Kohree Butyl Sealant Tape	$12	0.8	Details	Buy
Greatshoot Butyl Tape Waterproof Sealing Tape	$6	0.5	Details	Buy

Core Power Plays

The specs and strengths that make it shine.

The longevity of decks varies greatly based on materials used.

“the copper treating is more reactive with the galvanized nail, which corrodes the nail, loosening the fit, letting in moisture and causing that dreaded squeak.”➕

“Imagine if you sprayed each hole before the screws went in.”➕

Historical use and adaptation in building practices

“the joist tape helps prevent that water from entering through fastener penetrations and bulk water wetting by covering the top horizontal edge. That alone is phenomenal, and increasingly helpful where leaves and debris get caught in between boards.”➕

Industry practices vary widely

“I’m pretty sure the industry standard is a barely functional alcoholic globs on whatever adhesive or sealant they have on hand.”➕

Discussion on preferred sealants and alternatives

“MS Polymer sealants are the best IMHO.”➕

Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.

Alternative sealing methods discussed

“5200 is reserved for permanent structural sealing.”➕

Debate on the best sealant for teak

“wouldn't something like BoatLife or 3M 4200 work?”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’

Use of joist tape is seen as a personal preference.

“the top rated comment here says it more of a personal preference, so don’t use this site as your final word.”➕

Personal preference on using joist tape

“It’s been done in Australia for many, many years.”➕

Preference for butyl tape over other sealants discussed

“Only use 5200 if you’re absolutely sure you’ll never have to make this repair again.”➕

Personal experiences with installation techniques

“I'm pretty nervous about the install and want to do it right.”➕

“You may be overthinking it. (This is from someone who overthinks things *constantly)*”➕

Alternatives to butyl tape mentioned

“You can also get a tube of 3m 5200 sealant (or 5300 slow set) I've used it for roof vents and I've used for boat windows and thru hulls below the waterline.”➕

Inquiry about sealants for window leaks on boats

“i came here to see if anyone has some recommendations for sealant or sees a better way to fix this problem.”➕

“if you ever try to pull any off, you'll find out very quickly it does its job well.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.

Joist tape's effectiveness is debated among builders.

“At the end of the day, as a contractor, we have seen what works and doesn't but the homeowner has the final say in most cases.”➕

“Work in progress is more understandable than traps moisture and worsens wood rot.”➕

“Last forever.”➕

Historical use of joist tape and other materials for deck building.

“Maybe joist tape and a quick and efficient way to “Wet Install” the fasteners?”➕

“Joist tape seems like it would offer similar protection but with a much easier application which is why I’m opting to rebuild it with tape.”➕

Concerns about moisture retention and wood rot.

“At the end of the day it's not going to stop the planks from rotting and needing replaced down the road.”➕

“Water follows that path but can’t get out and is basically injected into the framing member.”➕

Debate on sealants effectiveness

“I have a ‘98 Fleetwood I’m in the process of resealing.”➕

“Best part is it lasts ~10yrs vs sealant that needs to be (supposed to be) checked semi annually and reapplied annually.”➕

“Done properly you would remove old caulking and apply the new stuff.”➕

“Everyone is in love with it in this sub.”➕

Misunderstanding of butyl tape properties

“Butyl tape isn’t “tape” it is a grey gummy rubber that never hardens.”➕

Debate about the necessity of adhesive for window installations

“From the research I did today it looks like butyl is preferred so I think I'm gonna use butyl tape.”➕