Is it safe to use near hot water baseboard radiators? I want to use it behind radiator cover as a temporary fix for a cold draft.

I suspect it would be safe if between the wall and the top cover of the baseboard, assuming you have standard baseboard covers like mine -- which never get super hot. It's foam, and will likely melt if too close to a heat source. To be on the safe side, I'd suggest first contacting the company directly.

I live in an apartment and i feel a draft coming through the cracks of my window would this help? Im trying to avoid using weather tape

I purchased the medium backer rod and they are 1/2" thick. I think the one I purchased would be too thick to insert into the crack of your windows. Maybe there is a smaller version that would work for you.

What caulking do u need for this ?

I did use caulk as it was used to support a garage door seal as the bottom of the door.

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M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480

M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480

Product ID: 77420348

Details

Brand
M-D Building
Colour
Gray
Item form
Paste
Item weight
9 g
Maximum gap fill
0.5 Inches

💧Closed-cell, non-absorbent polyethylene

📏20 ft. length for extended coverage

🧱0.5 in. max gap fill

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฿3803

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal smart, save big—because your projects deserve the pro touch!

EXTENDED REACH - Generous 20-foot length ensures you cover large projects without constant replacements.
PEST ENERGY SHIELD - Creates a tight seal that blocks pests and improves insulation, saving you money and hassle.
PRECISION GAP FILLER - Perfectly sized 0.5-inch diameter to seal cracks and joints with professional accuracy.
DURABLE WATER RESISTANT - Closed-cell polyethylene resists moisture and prevents damage, keeping your work pristine.
EASY MULTI STRAND FLEXIBILITY - Twist multiple rods together to customize fill for wider gaps—no compromises on fit.

M-D Products .50in. x 20ft Backer Rod is a high-performance, closed-cell polyethylene foam designed to fill and insulate gaps in pavement cracks, wall joints, foundations, sidewalks, and driveways. Its non-absorbent, water-resistant material prevents moisture intrusion and pest entry, while the flexible design allows multiple strands to be twisted for larger gaps. Ideal for professional-grade weatherization and finishing, this 20-foot gray rod ensures durable, efficient sealing that enhances both protection and energy savings.

Specifications

ASIN	B000BQWOC0
Best Sellers Rank	586,495 in Beauty ( See Top 100 in Beauty ) 6,410 in Body Oils
Brand	M-D Building Products
Colour	Gray
Customer Reviews	4.6 out of 5 stars 3,755 Reviews
Global Trade Identification Number	00043374714807
Item Form	Paste
Item Weight	0.02 Pounds
Item form	Paste
Item weight	0.02 Pounds
Manufacturer	M D Building Products
Manufacturer Part Number	71480
Material	Polyethylene (PE)
Maximum Gap Fill	0.5 Inches
Maximum gap fill	0.5 Inches
Model Number	71480
Number of Items	1
Surface Recommendation	wall
Surface recommendation	wall
UPC	043374714807
Unit Count	1.0 count
Water Resistance Level	Water Resistant

Reviews

J**N

Great quality & sealing ability, highly versatile & easy to use.

High quality & works just as advertised. Seals like a champ. When it comes to sealing air gaps whether it be around window frames, doors, moldings, baseboards, concrete, etc. you get what you pay for. Go for the better quality. It's easy to use, cut, install, highly versatile. This is a great & trusted product.

31.03.2026

R**I

Quality is Good but cost is too much

Cost is too much.. Similar products are available in lowest prices..

23.11.2018

N**I

Used for my dogs ears

I’ve been using very thin backer rod for posting my dog’s ears, and it’s been a fantastic solution! It’s lightweight, flexible, and provides just the right amount of support without causing any discomfort. It’s easy to cut to size and stays in place securely. Plus, it’s gentle on the ears and works perfectly with sports tape. Highly recommend for anyone looking for a reliable and comfortable ear-posting method!

31.12.2024

F**S

Medida perfecta para rellenar el espacio entre Ventana y Pared

Me gusta como funciona el Backer-rod es para rellenar los costados entre espacio entre la ventana y la pared para no gastar demasiado silicon

12.02.2026

D**H

Excellent stuff.

All Doggy people should use this ,who post their puppy's ears.Excellent stuff.

17.03.2018

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TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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