Best product to fill small gaps between plasterboard and wall

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Dec 14, 2018
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Hi lovely people

I've sealed off some leaks on my flat roof extension over my bathroom and now I am repairing some water damage at the junction of the plasterboard roof and the wall. The edge portion needs to be filled. I tried Polyfilla previously but I don't think it's the best water resistant product? I've run my dehumidifier overnight to help dry out any residual moisture .

Any better products that I can fill then paint over tomorrow?

Kind wishes
Michael
 

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