Originally Posted by
ianjk
How strong is Draino? I would assume you are loosing some parent material when you leave it sitting in the solution that long... Also, you would need to really, really clean it up and neutralize (especially on deep rims with double walls).
when using lye to strip anodize off aluminum, you only want to leave it on for 10 mins or so. any longer and pitting will occur.
one trick with a aluminum stem or seatpost stuck in a steel frame is too keep the area soaked in lye for a few days. it will eat the aluminum completely but not affect the steel.