At Rowhunter's suggestion, I'm starting a PVC thread. I use it for all my lure building, for the following reasons:   It is totally waterproof, so I can shape a lure, and then test float and ballast it without any sealing.  I have a 3 gallon bucket of water in my driveway that I use for test floating.     It is buoyant.  The Azek PVC decking is as buoyant as poplar, a hardwood I used to build my  jointed swimbaits from. The Azek trimboard is even more buoyant, like medium density balsa.  I