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Hi! I'm assuming that you're talking about a steam radiator. If that's the case it is perfectly safe to use the fill fabric around it. If it's some other type of radiator or you still have questions please give our support line (847.947.0029) a call and one of our tech support people will be able to guide you.
Yes, you can do that. In fact, I did the same at my house to keep the wasps from building nests behind the facia on my house. The material is made of stainless steel wool and poly fibers and won't rust or stain.
It might work.. I'm not sure how long it would last if it gets wet. It would rust eventually. Do you own a staple gun?
Your idea sounds good. Some people plant peppermint around the base of buildings to keep other rodents out.
Eventually it would rust away if exposed to damp conditions. It would probably do better inside or under a building than a fence.
The roll I checked was 6 feet long.
Not sure. The instructions exclude use on surfaces that exceed 270 deg. F. It doesn't specify why. You could try a small sample under controlled conditions.
It would work where you put it, but they could very easily cut a hole anywhere in the wood floor and get inside that way.