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Expanding foam, topped off, with sand and cement. Or, just sand and cement, pushed well into the gap.
Expanding foam, as stated above.
I'd buy a very small (1kg) bag of Mortar Mix. Just add water.
This also saves you cutting,sanding,coating with something else and then painting that you would have to do with expanding foam.
This also saves you cutting,sanding,coating with something else and then painting that you would have to do with expanding foam.
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