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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MD Building Foam Backer Rod, Gray, 1/2in x 20ft for Medium Gaps

MD Building Foam Backer Rod, Gray, 1/2in x 20ft for Medium Gaps

Product ID: 4877844

Details

Brand
M-D Building
Color
Gray
Item Form
Specialty
Item Weight
9.07 g
Maximum Gap Fill
0.5 inches

✂️Easily trims with scissors

🌧️Waterproof & weather-resistant

🛠️0.5in max gap fill

MD Building Foam Backer Rod, Gray, 1/2in x 20ft for Medium Gaps

Product ID: 4877844

Details

Brand
M-D Building
Color
Gray
Item Form
Specialty
Item Weight
9.07 g
Maximum Gap Fill
0.5 inches

✂️Easily trims with scissors

🌧️Waterproof & weather-resistant

🛠️0.5in max gap fill

637500₫

Duties & taxes included

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal the gap, seal your comfort—don’t let drafts crash your vibe!

SEAL LIKE A PRO - Effortlessly fills medium gaps up to 1/2 inch for airtight, draft-proof results.
PRECISION FIT EVERY TIME - Flexible and easily trimmed to size, ensuring a perfect fit for any joint or crack.
CAULK SMARTER NOT HARDER - Creates a sturdy base that prevents caulk waste and enhances adhesion for long-lasting seals.
BUILT TO BRAVE THE ELEMENTS - Crafted from durable, waterproof closed-cell foam that withstands rain, dust, and insects.
INDOOR OUTDOOR VERSATILITY - Ideal for everything from window sills to driveways—your all-in-one gap-filling solution.

The MD Building Foam Backer Rod is a 1/2 inch by 20-foot gray closed-cell foam roll designed to fill medium gaps in walls and joints. Waterproof and weather-resistant, it provides a durable, flexible base for caulking, preventing drafts, moisture, dust, and insects from entering your space. Easy to install and trim, it’s perfect for both indoor and outdoor use, enhancing insulation and extending the life of your caulk.

Specifications

ASIN	B000BQWOC0
Best Sellers Rank	#1,328 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Weather Stripping
Brand Name	M-D Building Products
Color	Gray
Customer Reviews	4.6 4.6 out of 5 stars (5,440)
Global Trade Identification Number	00043374714807
Included Components	1 Foam Backer Rod Roll
Item Form	Specialty
Item Highlight	Closed-Cell Foam, Prevents Caulk Waste, Cuts With Scissors, Blocks Drafts Moisture Dust Insects, Indoor/Outdoor
Item Type Name	Backer Rod
Item Weight	9.07 g
Manufacturer	M-D Building Products
Material Type	Foam
Maximum Gap Fill	0.5 inches
Model	71480
Number of Items	1
Number of Packs	1
Part Number	71480
Surface Recommendation	wall
UPC	043374714807
Unit Count	1 Count
Water Resistance Level	Waterproof

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