Oooh, I just did this too! Beadboard and 1x3 is an amazing way to give contractor-grade tubs a built-in, designer look. The big trick here is making sure you seal, seal, seal. This ensures no water leaking which can lead to rot. Paint the back and the front of the beadboard with semi-gloss paint, then add a bead of silicone along the edges of the trim.
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