LIGHTWEIGHT WONDER - Weighing only 0.5 ounces, it's easy to handle and install.
CUSHIONING CHAMPION - Perfect for various cushioning and insulating needs around the home.
VERSATILE APPLICATION - Compatible with virtually all cracks and sealants for maximum utility.
The Frost King C21H Caulk Saver is a 3/8-inch by 20-foot long foam strip designed to effectively seal drafts and cracks. Made from durable polyurethane, it is waterproof and suitable for various surfaces, including walls and sinks. This lightweight solution is perfect for both insulation and cushioning needs, making it a must-have for any home improvement project.
Specifications
Item Weight
0.5 Ounces
Item Form
Foam
Color
Gray
Material Type
Polyurethane
Surface Recommendation
Walls, Sink
Water Resistance Level
Waterproof
Have a Question? See What Others Asked
Can I use this around my bathtub?
Does this come in white???
Would this help with soundproofing gaps?
What size do I need for a 1/2 in gap?
Reviews
4.6
All from verified purchases
A**K
Used as backer rod for filling cracks in sidewalk
I needed something to use as a backer rod for large cracks in my sidewalk. I had watched YouTube videos where this product was used and also pool noodles, but I didn't want to have to cut up product to stuff into cracks before adding chalk to the cracks to fill and seal them, so I got this stuff in various sizes.This product worked perfectly for my project and was easy to use. You can twist, bend and stuff it into cracks with ease and it's flexible to it moves with heat expansion and cold contraction. I cleaned the cracks in the sidewalk, added this backer rod by pressing it into place with the edge of a screwdriver, and then added self-leveling chalk to the crack. I added sand on top of that, which helped things blend better than if I'd just filled them and left the chalk exposed. The results were great and this product worked as expected. I wouldn't hesitate to recommend it to others or use it again myself.
R**L
Nice to fill in large gaps and save sealant
Works as it's supposed to. Used to fill in a number of gaps in crawl space and basement areas and it did the job. Was able to manipulate to apply to a many different spaces. Worked as expected.
C**M
Lightweight, Slightly flexible, Translucent, Made in Canada
It is lighter in weight than expected. That is not a problem, just unexpected. It is not flexible like rubber would be, but it is flexible enough to use as intended as a caulk backer or a weather seal. I used it as a seal. When direct sunlight hits it, you can see light through it (i.e. translucent). The package says it is Made in Canada.
D**N
Fixed a sliding glass door gap and stopped the draft.
We had a drafty seal on our sliding patio glass door because of an earthquake-caused misalignment.Fortunately, the glass did not break, but the panel alignment shifted enough so that It is not possible to adjust the doors far enough to thoroughly seal the gap, so we use this flexible compressible caulk saver to do so.In addition to being affordable ($2 on sale), the caulk saver is removable and reusable. We don't use ANY caulk in this application -- just to stuff and seal the small door gap.It takes less than a minute to insert the foam strip and it's compressible so that it will fit into the gap and expand enough to be an effective seal.We can quickly remove the strip when we want to open the door, and seal it back up in less than a minute.While this isn't a perfect and permanent fix, it's cheap, fast and much less expensive than installing a new door system.I've attached my image -- it's not necessary to leave such a large overhang, but we do so to make it easier to remove and replace the foam strip.
G**N
Best filler
This wad easy to use, and did a great job. I stuffed the the Crack between my porch and the house wall. Then I caulked it with self leveling caulk. The job turned out great.
D**K
Good product
I use it in a number of interior places each winter. It help to keep the house warm!
C**L
Took two weeks to arrive
My the time I received the product my project was finished.
T**T
Did the job
There is no adhesive. I tried a hot glue gun at first. But, not good. Melty melt. Cut a chunk off Wood glue did the trick to keep it in the cracky crack. Now proudly serving its purpose in life.
S**N
This works like a charm.
We used it to fill the sawed out cuts in our patterned cement patio.
C**N
Truck Weather Seal fix
I used this for a hack I found on Youtube. I have a 2005 Chevy truck and the air noise was becoming overbearing while highway driving. I literally cut my weather seal on my front doors open and used a metal coat hanger, duct tape to attach this to the coat hanger, a little silicon lube to help with friction and voila.I have dang near air tight front doors, the noise difference is AMAZING. Today there are 70kmph gusts and while on the highway I had practically no air whooshing through the door seal. Basically a factory seal again.2 of these will do the front doors, i had to do it in 1 and 2 foot increments. There were a a lot of cuts which I sealed with Black RTV silicon.
S**E
Works great when caulking those big gaps.
This one was a bit thinner than I thought it was going to be, so I couldn’t use it for the really big gaps I have, but it did help with the not so big gaps. That was my fault I guess for not knowing the proper measurement I needed. I do find that this is a bit expensive for what it is but I’m glad I had it. $12. Cheaper than wasting caulking in big gaps.
H**S
Excelente producto
Realmente recomiendo este producto ha hecho mejora en el aislamiento de mis ventanas correctamente y ha solucionado filtraciones de aire al mínimo. Lo recomiendo extensamente.
L**L
used for ear posting
this size is good for when pup is young, but would not use it after 5/6 months old since it is quite thin. a bigger diameter would be better for shaping larger ears. no problems with this product though, it's soft and pliable and easy to shape. no odours or allergic reactions.
Common Questions
Trustpilot
TrustScore 4.5 | 7,300+ reviews
Vikram D.
The MOLLE sheath is of exceptional quality. Very happy with my purchase.
2 weeks ago
Farhan Q.
The delivery time was excellent, and the packaging was secure.
","image":["https://m.media-amazon.com/images/I/81ysBNZSnlL.jpg","https://m.media-amazon.com/images/I/814DenE4BRL.jpg","https://m.media-amazon.com/images/I/91rUe4Wc4tL.jpg","https://m.media-amazon.com/images/I/71XDgidd3BL.jpg","https://m.media-amazon.com/images/I/71uSQtRe-HL.jpg","https://m.media-amazon.com/images/I/91VgzAugkuL.jpg"],"offers":{"@type":"Offer","priceCurrency":"EUR","price":"17.50","itemCondition":"https://schema.org/NewCondition","availability":"https://schema.org/InStock","shippingDetails":{"deliveryTime":{"@type":"ShippingDeliveryTime","minValue":14,"maxValue":14,"unitCode":"d"}}},"category":" caulk","review":[{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"A***K"},"datePublished":"Reviewed in the United States on August 27, 2022","name":"5.0 out of 5 stars\n\n\n\n\n\n\n\n \n \n Used as backer rod for filling cracks in sidewalk\n \n","reviewBody":"I needed something to use as a backer rod for large cracks in my sidewalk. I had watched YouTube videos where this product was used and also pool noodles, but I didn't want to have to cut up product to stuff into cracks before adding chalk to the cracks to fill and seal them, so I got this stuff in various sizes.This product worked perfectly for my project and was easy to use. You can twist, bend and stuff it into cracks with ease and it's flexible to it moves with heat expansion and cold contraction. I cleaned the cracks in the sidewalk, added this backer rod by pressing it into place with the edge of a screwdriver, and then added self-leveling chalk to the crack. I added sand on top of that, which helped things blend better than if I'd just filled them and left the chalk exposed. The results were great and this product worked as expected. I wouldn't hesitate to recommend it to others or use it again myself."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"R***L"},"datePublished":"Reviewed in the United States on May 26, 2023","name":"5.0 out of 5 stars\n\n\n\n\n\n\n\n \n \n Nice to fill in large gaps and save sealant\n \n","reviewBody":"Works as it's supposed to. Used to fill in a number of gaps in crawl space and basement areas and it did the job. Was able to manipulate to apply to a many different spaces. Worked as expected."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"4.0"},"author":{"@type":"Person","name":"C***M"},"datePublished":"Reviewed in the United States on August 9, 2021","name":"4.0 out of 5 stars\n\n\n\n\n\n\n\n \n \n Lightweight, Slightly flexible, Translucent, Made in Canada\n \n","reviewBody":"It is lighter in weight than expected. That is not a problem, just unexpected. It is not flexible like rubber would be, but it is flexible enough to use as intended as a caulk backer or a weather seal. I used it as a seal. When direct sunlight hits it, you can see light through it (i.e. translucent). The package says it is Made in Canada."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"D***N"},"datePublished":"Reviewed in the United States on January 21, 2021","name":"5.0 out of 5 stars\n\n\n\n\n\n\n\n \n \n Fixed a sliding glass door gap and stopped the draft.\n \n","reviewBody":"We had a drafty seal on our sliding patio glass door because of an earthquake-caused misalignment.Fortunately, the glass did not break, but the panel alignment shifted enough so that It is not possible to adjust the doors far enough to thoroughly seal the gap, so we use this flexible compressible caulk saver to do so.In addition to being affordable ($2 on sale), the caulk saver is removable and reusable. We don't use ANY caulk in this application -- just to stuff and seal the small door gap.It takes less than a minute to insert the foam strip and it's compressible so that it will fit into the gap and expand enough to be an effective seal.We can quickly remove the strip when we want to open the door, and seal it back up in less than a minute.While this isn't a perfect and permanent fix, it's cheap, fast and much less expensive than installing a new door system.I've attached my image -- it's not necessary to leave such a large overhang, but we do so to make it easier to remove and replace the foam strip."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"G***N"},"datePublished":"Reviewed in the United States on May 31, 2022","name":"5.0 out of 5 stars\n\n\n\n\n\n\n\n \n \n Best filler\n \n","reviewBody":"This wad easy to use, and did a great job. I stuffed the the Crack between my porch and the house wall. Then I caulked it with self leveling caulk. The job turned out great."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"D***K"},"datePublished":"Reviewed in the United States on December 10, 2022","name":"5.0 out of 5 stars\n\n\n\n\n\n\n\n \n \n Good product\n \n","reviewBody":"I use it in a number of interior places each winter. It help to keep the house warm!"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"3.0"},"author":{"@type":"Person","name":"C***L"},"datePublished":"Reviewed in the United States on July 25, 2022","name":"3.0 out of 5 stars\n\n\n\n\n\n\n\n \n \n Took two weeks to arrive\n \n","reviewBody":"My the time I received the product my project was finished."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"T***T"},"datePublished":"Reviewed in the United States on October 26, 2022","name":"5.0 out of 5 stars\n\n\n\n\n\n\n\n \n \n Did the job\n \n","reviewBody":"There is no adhesive. I tried a hot glue gun at first. But, not good. Melty melt. Cut a chunk off Wood glue did the trick to keep it in the cracky crack. Now proudly serving its purpose in life."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"S***N"},"datePublished":"Reviewed in Canada on September 20, 2021","name":"\n\n\n\n\n\n\n\n \n \n This works like a charm.\n \n","reviewBody":"We used it to fill the sawed out cuts in our patterned cement patio."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"C***N"},"datePublished":"Reviewed in Canada on November 16, 2021","name":"\n\n\n\n\n\n\n\n \n \n Truck Weather Seal fix\n \n","reviewBody":"I used this for a hack I found on Youtube. I have a 2005 Chevy truck and the air noise was becoming overbearing while highway driving. I literally cut my weather seal on my front doors open and used a metal coat hanger, duct tape to attach this to the coat hanger, a little silicon lube to help with friction and voila.I have dang near air tight front doors, the noise difference is AMAZING. Today there are 70kmph gusts and while on the highway I had practically no air whooshing through the door seal. Basically a factory seal again.2 of these will do the front doors, i had to do it in 1 and 2 foot increments. There were a a lot of cuts which I sealed with Black RTV silicon."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"4.0"},"author":{"@type":"Person","name":"S***E"},"datePublished":"Reviewed in Canada on July 13, 2022","name":"\n\n\n\n\n\n\n\n \n \n Works great when caulking those big gaps.\n \n","reviewBody":"This one was a bit thinner than I thought it was going to be, so I couldn’t use it for the really big gaps I have, but it did help with the not so big gaps. That was my fault I guess for not knowing the proper measurement I needed. I do find that this is a bit expensive for what it is but I’m glad I had it. $12. Cheaper than wasting caulking in big gaps."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"H***S"},"datePublished":"Reviewed in Mexico on March 29, 2019","name":"\n\n\n\n\n\n\n\n \n Excelente producto\n \n \n","reviewBody":"Realmente recomiendo este producto ha hecho mejora en el aislamiento de mis ventanas correctamente y ha solucionado filtraciones de aire al mínimo. Lo recomiendo extensamente."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"L***L"},"datePublished":"Reviewed in Canada on April 8, 2022","name":"\n\n\n\n\n\n\n\n \n \n used for ear posting\n \n","reviewBody":"this size is good for when pup is young, but would not use it after 5/6 months old since it is quite thin. a bigger diameter would be better for shaping larger ears. no problems with this product though, it's soft and pliable and easy to shape. no odours or allergic reactions."}],"aggregateRating":{"@type":"AggregateRating","ratingValue":4.6923076923076925,"bestRating":5,"ratingCount":13}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Can I use this around my bathtub?","acceptedAnswer":{"@type":"Answer","text":"It is a foam cord that is pushed into large cracks so caulk can be applied on top. Would not work for bathtub unless you have a large crack that is too large for caulk."}},{"@type":"Question","name":"Does this come in white???","acceptedAnswer":{"@type":"Answer","text":"I personally haven’t seen white, but perhaps check the Frost King site to see if that’s even an option. Thanks for your interest and sorry I couldn’t be off more help!"}},{"@type":"Question","name":"Would this help with soundproofing gaps?","acceptedAnswer":{"@type":"Answer","text":"While it is not designed as a soundproofing product I do suppose that it would help to some degree in this manner. Other products designed with soundproofing in mind however I feel would be more effective. Hope this helps!"}},{"@type":"Question","name":"What size do I need for a 1/2 in gap?","acceptedAnswer":{"@type":"Answer","text":"If the gap has jagged edges to hold the backer rod in place, the 1/2” should work. Otherwise you will have to use 3/4 and push it into the gap."}}]}]}
