Would flex tape/spray work on a leaky radiator?

Thank you for reaching out! Flex Seal Spray has not been tested on this type of application, it is not made to withstand extreme heat or pressure. Flex Tape however will function in temperatures from -70º – 200ºF. Lucas - Customer Care at Flex Seal Products (Swift Response The makers of Flex Seal)

how much coverage is in one 14oz can

I don’t know. I aborted my project after it started melting away.

Is the spray good to use in a dish washer with hot water. To be used on dish racks

Flex Seal is not FDA approved and should not be used around items that will be exposed to things you will be eating/drinking out of.

Will this stick to galvanized metal / steel ... ??? Thanks ,,!!

It didn’t work as advertised for me. I’d talk to my helpful Hardware Man…

Flex Seal 14 Oz 4 Pack White Stop Leaks Instantly

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

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Description

💪 Seal it, protect it, own it—Flex Seal your way to leak-proof confidence!

CUSTOMIZABLE FINISH - Dries white and paintable to match any aesthetic—blend in or stand out.
INSTANT LEAK STOPPER - Spray on and seal leaks fast—no downtime, no mess.
MULTI SURFACE MASTER - Perfect for gutters, roofs, wood, RVs, windows, and more—versatility that fits your lifestyle.
ALL WEATHER DURABILITY - Withstands scorching heat and freezing cold without cracking or peeling.
FLEXIBLE LONG LASTING - Rubberized coating stays pliable for years, adapting to surface shifts.

Flex Seal is a 14 oz spray-on rubberized sealant that instantly stops leaks by creating a waterproof, flexible coating. Designed for durability, it resists extreme temperatures without sagging or cracking and adheres to multiple surfaces including wood, metal, and asphalt. Paintable after drying, this 4-pack offers a versatile, long-lasting solution for home, RV, and outdoor repairs.

Specifications

ASIN	B01AKPHYCQ
Best Sellers Rank	#228,711 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #734 in Hardware Sealers
Brand	Flex Seal
Brand Name	Flex Seal
Color	White
Compatible Material	Asphalt, Metal, Polyvinyl Chloride
Customer Reviews	4.5 out of 5 stars 416 Reviews
Included Components	Flex Seal Spray Rubber Sealant Coating, 14-oz, White (4 Pack)
Item Dimensions	9.5 x 2.5 x 2.5 inches
Item Form	Liquid, Spray
Item Weight	14 ounces
Item dimensions L x W x H	9.5 x 2.5 x 2.5 inches
Manufacturer	Swift Response, LLC
Material	Liquid
Material Type	Liquid
Model	8542053263
Number of Items	4
Part Number	FSWHTR20-4
Style	FSWHTR20-M-4PK
Style Name	FSWHTR20-M-4PK
Surface Recommendation	Roof,Windows,Wood
Unit Count	56 Ounce
Water Resistance Level	Waterproof

Reviews

D**N

Sealer

Product works as described. Packaging was excellent, product arrived in perfect condition.

18.03.2026

A**R

Great product

This product works. Water tight and durable.

4.05.2024

J**G

i like

as expected

3.12.2025

S**Y

Works well

This worked extremely well to seal cracks in my stucco.

14.03.2025

P**N

AMAZING PRODUCT

Love everything about this product!! And it doesn’t yellow on my White House unlike the traditional caulking!! This is my go to product to use and definitely worth the $$$

23.09.2021

J**Y

Worked perfectly

I needed to spray an old camper shell for my truck and I used the flex seal and it worked perfectly keeps the water out and looks so much better

28.01.2024

S**N

Boat seal

It worked well and sealed my boat. Dislike is the price I found was cheaper local than through Amazon.

21.05.2024

D**H

Not as much in the can as expected.

I used all 4 cans on a single 38"× 75" space and still did not get full coverage.

30.04.2023

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