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  • I wasn't recommending expanding foam. It's just a different type of caulk saver, it's flat not round. Since you need to cover it with some sort of caulk you'll probably want to use masking tape for that as well. I certainly do these days. I use a few other time savers from sealants online too.

  • Yeah I get you. Hadn’t realised you meant taping for the caulking! That’ll come much later, if at all. The draft is the main issue, so I want to sort that to just keep the place warm.
    I’ll probably take the time to use some beading to actually cover the gap eventually.

  • In that case the flat one from sealants online might suit you because you can push it in the gap and then run a really sharp blade along it and you might get a decent finish anyway. It's prone to tearing if the blades not super sharp.

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