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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🛠️ Seal smart, live comfortable — the pro’s choice for airtight perfection!

PRECISION GAP SEALING - Fill medium gaps up to 0.5 inches with unmatched accuracy for a flawless finish.
ALL WEATHER DURABILITY - Crafted from premium waterproof foam that stands strong rain or shine.
EFFORTLESS INSTALLATION - Push in place and trim with scissors—no adhesives or mess required.
VERSATILE HOME PROTECTION - Perfect for windows, doors, driveways, and more to block drafts and dust.
FOUNDATION FOR FLAWLESS CAULKING - Creates a sturdy base ensuring long-lasting, professional-grade caulk adhesion.

The M-D Building Products 71480 Backer Rod is a 1/2-inch thick, 20-foot long gray foam rod designed to fill medium gaps in walls and concrete joints. Waterproof and weather-resistant, it provides a durable, easy-to-install base for caulking, enhancing insulation and draft prevention both indoors and outdoors. Made in the USA, it’s a versatile, mess-free solution trusted by professionals for lasting gap sealing and improved home comfort.

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Colour	Gray
Brand	M-D Building Products
Item Weight	9 g
Item Form	Foam
Maximum Gap Fill	0.5 Inches
Surface Recommendation	wall
Water Resistance Level	Waterproof
Number of Items	1
Manufacturer	M-D Building Products
UPC	043374714807
Global Trade Identification Number	00043374714807
Net Quantity	1.0 Count
Material	Foam
Country of Origin	USA
Item model number	71480
Product Dimensions	30.48 x 22.23 x 5.08 cm; 9.07 g
ASIN	B000BQWOC0

M-D Building Products 71480 1/2-Inch by 20-Feet Backer Rod, Gray

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