Redid my Bonneville intakes a few years ago.
Recurring leaks cured with homemade gaskets and the "H"
Follow the directions, but you'll need a microscope to read the text on the tube,
They recommend acetone to remove.
Small tube is lasting.

 

+1 on the acetone. I had all 3 capped but they went sour on me. I didn't like the mess I made 'cause it was so sticky. I may have bought it from Amazon so no telling how old it was.