If you build lures out of PVC, you may have experienced problems getting a smooth surface for painting. Here's a tip that will give you a very smooth bait.
After the bait is assembled, spray it with Rust-Oleum Stops Rust automotive primer. Once it's dry, sand it with a piece of paper until the primer is shiny. You will end up with a very smooth bait, and the primer will also fill in minor scratches left on the bait from sanding.