UPS delivered my new Tour Pack and associated goodies the other day. Got most of the assembly done last night. Today I'm out putting the luggage rack on top of the tour pack. Instructions mention putting a sealant on the washers and bolts used to attach the rack to the top of the pack to prevent water leaking into the pack. What kind of sealant does everyone recommend? I guess if you only put it on the inside of the pack it still seals OK? Don't want any excess oozing out up top where it would be visible, or does it dry crystal clear? Please forgive me for being so dumb!