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Question: My friend has a new Felt AR2 and on the weekend we went out for a long ride. Rain was on and off but never to the point where we were soaked. So today doing some after weekend maintenance, we noticed some water dripping out of the seatpost when turned upside down. Water continued to trickle so we decided to take out the post and drain it. We drained a good 8-12 oz. of water out of the bike.
It seems like water enters the frame on the trailing edge of the aero seatpost. I suggested using some silicone sealant to close up that gap but we are unsure about any reactions with carbon. Maybe an Oxygen Sensor Safe Sealant would work best.
You needn’t worry about a reaction between a carbon frame and silicone sealant. And as long as you’re not running gasoline in that bike, there’s no need for Oxygen Sensor Safe Sealant, although that also could do the trick.