Rubbing alcohol is not pure, denatured is a bit better, Rubbing alcohol
leaves a visable residue , possibly its the poison in it. JB weld does
not recomend at all Alcohol to clean surfaces because of possible
petroleum products in it. Rubbing alcohol wont clean a camera lens
correctly.

I just did a repair with JB weld in 48hrs at 10-20f it cured hard, JB
says it cures to -60f