If you want a sealant that will apply in one step, cure rather quickly (more quickly in moisture), and that might have discoverable uses far beyond the one you bought it for, then try Dow Corning's 730 Solvent Resistant Sealant.
Its primary use is in fuel tank or line situations, where you want the sealant to last under an onslaught of fuel or other solvents. Because it hardens into a rubber with a tensile strength of around 300 pounds per square inch, it won't be bothered by vibration. In addition, it stores well, and cures well by drawing from ambient moisture.
But be quick: Once you've squeezed DC 730 out of the tube to apply it to the surface, you have about 10 minutes before the thin skin begins to form over the substance. From there on out it becomes progressively harder to work with. It will be its fully cured, beautiful, solvent-resistant self in about 24 hours.
Read the Dow Corning Silicone Sealant Brochure for more information.