I wash them in warm water with blue Dawn dish soap after waiting 5 days from casting them. The 305 didn't like the Duplicolor primer. It made it gummy. The task 16 was fine with the Duplicolor primer. The Rustoleum seems to have a real solid bond with the 16 but it just has a slightly tacky feel to it. I think if I cleared them the paint would hold up better. I just got back from the place I get my Smooth On stuff from and spent an hour talking to them about what I want to accomplish. They gave me some interesting tips and I am going to try them and will post my results.