This will seem like a bizarre question, but does it smell? (Like the majority of Chinese-made closed cell foam materials.)

I use it for taxidermy purposes and havent noticed any smell.

Can i use that to repair my garage floor cracks with the concrete caulk?

I wouldn’t. It’s just foam. If the crack is huge I would use sand as a filler and apply a deep layer of concrete patch

does this break down or come apart easily when wet?

No. Its foam.. it doesnt break down at all

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M-D Building Products 20 ft Foam Large 71506 Backer Rod for Gaps and Joints, 5/8-by-20 Feet, Gray, Black, 5/8" x 20'

M-D Building Products 20 ft Foam Large 71506 Backer Rod for Gaps and Joints, 5/8-by-20 Feet, Gray, Black, 5/8" x 20'

Product ID: 51559533

Details

Brand
M-D Building
Colour
Black
Item form
Strip
Item weight
50 g
Surface recommendation
Door

✂️Easily trimmed to fit any gap size

🌧️Waterproof & weather-resistant durability

🛠️20 ft length for extensive coverage

€ 124.94

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

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Description

🔧 Seal Smart, Live Comfortable — The Ultimate Gap Solution

TRUSTED BY DIY PROS - Join over 1,300 satisfied users who rate it 4.6 stars for reliability and ease, making it a must-have for your toolkit.
SEAMLESS GAP MASTERY - Effortlessly fills and seals medium gaps up to 5/8", blocking drafts and dust for year-round comfort.
VERSATILE HOME ARMOR - Ideal for doors, windows, driveways, and sidewalks, it enhances insulation and damp-proofing across your entire space.
PRECISION FIT ZERO FUSS - Simply push into joints and trim with scissors—no adhesives or messy sealants needed for a clean, professional finish.
BUILT TO BRAVE THE ELEMENTS - Crafted from premium rubber vinyl silicone, this backer rod withstands rain, sun, and temperature swings without losing integrity.

The M-D Building Products 20 ft Foam Backer Rod is a durable, waterproof gap filler designed for medium-sized joints. Made from high-quality rubber vinyl silicone, it provides a reliable base for caulking, improves insulation, and prevents drafts and dust infiltration. Easy to install and trim, it’s perfect for both indoor and outdoor applications, including doors, windows, driveways, and sidewalks.

Specifications

ASIN	B000BQP1D4
Best Sellers Rank	775,851 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,426 in Weather Stripping
Brand	M-D Building Products
Colour	Black
Customer Reviews	4.6 out of 5 stars 1,365 Reviews
Global Trade Identification Number	00043374715064
Included Components	1 Foam Backer Rod Roll
Item Form	Strip
Item Type Name	M-D Building Products 71506 Backer Rod For Gaps and Joints, 5/8-by-20 Feet, Gray
Item Weight	0.11 Pounds
Item form	Strip
Item weight	0.11 Pounds
Manufacturer	M-D Building Products
Manufacturer Part Number	71506
Material	Rubber Vinyl Silicone
Model Number	MD Building - 71506
Number of Items	1
Number of Packs	1
Surface Recommendation	Door
Surface recommendation	Door
UPC	043374715064
Unit Count	20.0 meter
Water Resistance Level	Waterproof
Water resistance level	Waterproof

Reviews

N**M

Perfect ……

Recommended for purpose and was perfect

3.04.2022

S**R

Backer rod for gaps

I use this when I reline up cycled jewelry boxes, it works great for the ring rolls.

7.03.2021

Y**E

it Works

Good

30.11.2025

S**A

Backarod Good buy on Amazon

Not every store carries it so it was very convenient to have it delivered to my home next day from Amazon. Price was competitive and exactly what I needed

6.09.2023

M**S

Worked really well.

Worked really well. Used it in a space over an entrance door. Applied caulking over the top with a putty knife. Perfect result.

11.07.2021

B**Y

Exactly as advertised

Good quality, arrived quickly.

24.01.2023

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

View all Trustpilot reviews

€ 124.94

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

View all Trustpilot reviews