What is the holding power or tensile strength like? Looking to patch a load bearing torn seam on my heavy spa cover where it folds in half

Doubt this is what you are looking for

Will this seal a small hole on an alluminum boat

It would but I don’t know that it would be a good long term solution. I have used a product called Mr Sticky on an aluminum boat and it worked really well

Would this work in a shower tub seam

Might not look as smooth as caulk but it'll certainly do the job.

Can this be applied under water?

I don't know about applying under water, but it is good to keep water out. I had water coming into my basement from a crack in my patio. Put flex tape over the cement crack outside and haven't had any more water seep into the basement and hasn't for several years. Not that pretty, but it works!

Flex Tape Max White 4 In X 25 Ft | Desertcart Cote D' Ivoire

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Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal it. Fix it. Flex it. The ultimate tape for unstoppable repairs.

MADE IN THE USA - Proudly crafted with global materials, supporting quality and reliability you can trust.
FLEXIBLE DURABLE - Thick rubberized backing conforms to any shape, ensuring a leak-proof, long-lasting hold.
UNMATCHED STRENGTH - 400% more power to tackle your biggest repairs with confidence.
ALL WEATHER WARRIOR - UV resistant and built to endure extreme temperatures and harsh outdoor conditions.
VERSATILE APPLICATION - Seals instantly on wet, dry, and even underwater surfaces—perfect for pools, boats, and showers.

Flex Tape MAX White is a super-strong, waterproof repair tape with 400% more adhesive power, designed for large projects. It works on wet, dry, and underwater surfaces, resists UV rays and extreme weather, and features a thick, flexible rubber backing that seals leaks instantly. Ideal for indoor and outdoor use, it’s a trusted, American-made solution for professionals and DIYers alike.

Specifications

ASIN	B0916Q4VBZ
Adhesive Format	ROLL
Adhesive Location	linear
Adhesive Side Count	1
Brand	Flex Tape
Brand Name	Flex Tape
Color	White
Colour	White
Compatible Material	Stone
Customer Reviews	4.4 out of 5 stars 414 Reviews
Included Components	SWIFT RESPONSE - 101913
Item Dimensions L x W x Thickness	10.8L x 12.1W x 12.1Th centimeters
Item Resistance	waterproof
Item Thickness	39 Mils
Item Type Name	SWIFT RESPONSE - 101913
Item Weight	603 g
Manufacturer	Flex Tape
Material	Rubber
Material Type	Rubber
Model	SWIFT RESPONSE - 101913
Number of Items	1
Other Special Features of the Product	Strong
Part Number	SWIFT RESPONSE - 101913
Recommended Uses For Product	Outdoor
Recommended uses for product	Outdoor
Size Name	Large
Special features	Strong
Surface Recommendation	Shower, Tile, Wall
Tensile Strength	65 Pounds Per Inch
UPC	850017897328
Unit Count	1 Count
Water Resistance Level	Waterproof

Reviews

N**R

used in the shower on my schoolie

great sealer

16.06.2026

D**P

Seals great!

Excellent tape for hold and durability. This tape will stick! It's a bit of an art to peel off the backing, but we'll worth it.

15.04.2025

S**�

Recommend

Super good, sticks really well

5.12.2025

A**R

Very sticky and thick. I believe it’s worth it.

Very sticky so be careful. Can’t say how long it lasts but if it lasts like it sticks it should work fine.

11.10.2025

V**S

PITA to work with due to the excess glue

Too much glue on the tape. By the time I got my roll the glue had seeped out from the back of the tape and was all along the edges making my install messy. Tape worked great, just a PITA to work with due to the excess glue.

28.02.2025

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