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How to fill in a large gap behind toilet

Postby ozzy715 » Wed Jan 27, 2021 12:39 pm


I have redecorated the downstairs toilet and removed the previous MDF backing and replaced with a new one which is slightly thinner. This has now left a 1cm gap which i need to fill. What is the best way to fill in something like this? Ideally in a simple white finish.

I was looking at expandable filling foams which can be sanded down, but any other ideas would be helpful.

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