We are interested in using Composite railing on our covered porch. Our problem is... We have floor to ceiling tubing (4x4 square)along the porch that we would like to conseal in the composite railing product. We have not been able to find anyone that can tell us if this is possible, and if so, where do you buy it. The metal tubing has been welded into place, so the composite would have to be some sort of wrap to cover the tubing.... Can anyone give us some help? Thank you