It may become more flowing but it should still preclude any moisture from wicking into the cap. By condensation, I meant that it is formed from cooling temps at night forming moisture droplets on the inside of the cap, not from water coming in from the bottom of the cap. Perhaps I should have asked, "Is the water getting in from seepage or condensation?" It's a little easier to solve your problem if one knows how the moisture is getting into the cap. Since you live (or the car resides in So CA), my guess is that's it's not condensation unless it stored in a cool damp garage. Hope that helps.
What causes condensation?