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.

ASIN	B000BQWOC0
Are Batteries Included	No
Brand	M-D Building Products
Color	gray
Customer Reviews	4.6 4.6 out of 5 stars (3,654)
Date First Available	August 6, 2012
Item Weight	9.07 g
Material	Polyethylene (PE)
Model Number	71480
Product Dimensions	30.48 x 22.23 x 5.08 cm; 9.07 g
Quantity	1

（エムディー・ビルディング・プロダクツ）M-D Building Products 71480 バッカーロッド 1/2インチ×20フィート グレー- 1 Pack 71480 1 [並行輸入品]

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（エムディー・ビルディング・プロダクツ）M-D Building Products 71480 バッカーロッド 1/2インチ×20フィートグレー- 1 Pack 71480 1 [並行輸入品]