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  • Can anyone recommend a good DIY product for filling in these damp-inducing holes around my window?

  • Probably exterior silicone sealant, surprised the window fitters didn't use some originally.

    I would use masking tape either side of the joint (not too close to joint otherwise you will get a ridge when you remove it) apply a thick bead and use a smoothing tool for a nice neat bead.

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