After using 401, I will NEVER go back to gel...EVER.
I don't care that is costs 5 times as much. I know nothing's going to fall off.
For fun, and to see how good it is, I took a triangle(or Lepro...) that was laying(literally, maybe on floor) around and a rough finish ferrule. No prep. I didn't sand the tip flat, scuff, or even wipe with degreaser.
I let it sit for about 5 mins vertically. No clamping.
First I pushed up on the corner of tip. Couldn't knock it off.
Then I held it in my hand and tried a pair of Channel Locks. That had to work...right?
Yah NO.
I had to clamp the ferrule in a vise and, with Channel Locks, rip it off. Even then, the bond didn't fail. The tip ripped in half.