Originally Posted by 79pmooney

In my mileage-wise 8 trips around the planet I've never attempted to seal valve holes. Granted, always with aluminum rims. Nearly all of those miles were in or around Boston, Ann Arbor, The Bay Area, Seattle and Portland; riding year 'round. Rainfall 38-42" per years in all those cities. Some of my rides have been epic wet. I've ridden through water almost up to the BB. Rain that had the frogs cowering under whatever shelter they could find. I'd a thunk the issue of water in my rims would have raised its ugly head by now - if it mattered.

Oh, I've never done anything to dry my bikes after those ride. Just park them leaning against the shop table. Later or next day I hang them up. (Dirty or salty rides, they get hosed off before coming inside - if the hoses are hooked up and the water on - think freezing winters.