Yup, it's the same type of polyester resin material, and does not expand and contract the same as wood, and although sometimes it holds up indoors in some applications, I would not use it outdoors. Use a wood epoxy for outdoor wood instead.
If I understand you correctly, your wrapping a porch post to create an architectural column using trim board and your ending up with a lot of seam exposure- am I correct....:blink:
Try using FF biscuits and TB III , glue & clamp the column- good . You can sand the seam areas lightly after drying and the seam will not be visible if done correctly and will last as long as the wood is maintained with a repaint when needed . I am not a big fan of filling imperfections. Nail holes - understandably but major areas......
Jason Whipple is enamored with filling and restoring , he does nice work but I don't like the idea of fillers personally...
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