I've taken the collars off our radiator pipes at the point where they enter the wall while redecorating and found that some of them have quite large holes surrounding the pipe, up to the full diameter of the collar.
What can I use to fill these holes? I have Soudal gap filler expanding foam but not sure if that will be ok with the heat? Or I have regular Polyfilla, but without something behind Im not sure that will work. Or any other suggestions?
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