About 2 winters ago I bought a bar and chrome control package from Hill Country Cycles. I later learned the controls were made by Drag Specialties when I needed to replace the gasket. The sight glass is on the front of the master cylinder facing the rider.

Last night I decided to take the bike out for a ride and noticed fluid on my bar, under the master cylinder. After checking around the gasket and finding it dry, I realized the glass sight is leaking a bit.

Since there is no gasket for the sight glass, I was wondering if there was something I could seal it with from the inside that would stand up to DOT 4. If not, I'll need to get a new one - which sucks of course.