Hello , i recently re-constructed a front porch , in connecticut.  I used windsor one primed materials. Each column began with a 4 x 4 then wrapped 4 sides, then many pieces of trim applied to make them ornate as were the ones we demolished.  It came out great each column has aprox. 90 +/- pieces. i know hard to believe. They came out nice .  Problem is a lot of the pieces have now seperated after some weathering ( less than a month) I will need to return to site to make repairs.  Needless to say very dissapointing.  Question is what materials should I have used? And what should I use to make repairs ?  MDF? Fir? ???  Any suggestions appreciated … thanks    Rob