UV Aquaseal Knot sense creates a smooth finish to your whipping and knots. 1/4 oz small tube.
This is what I use on my wind on leaders.

The smooth fiinish not only allows them to run through your guides easier but also strengthens them and protects your wrapping.

Self levelling.
Just place in direct sunlight for a couple of minutes to cure.

It pays to warm the tube as much as possible in your hands or sun before use to help it flow better.