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If there is water leakage on the PVC gusset, there will be water beads condensation. If there is no condensation of water droplets, there is generally no leakage. I hope my answer can help you.
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You can remove the bath bomb to see if there are traces of water leakage on the original top surface.
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Find out the four perimeter lines, make a good keel frame, set the yin corners on three sides, and start the paneling. The last one needs to be bonded with structural adhesive after the board is installed.