Review on 💙 Permatex 24300 Surface Insensitive Threadlocker Blue, 0.34 Oz. - Strong Bonding Agent for Nuts & Bolts by Sean Young

EDIT (March 2010): It's still holding tight after 1.5 years! ---- Quick Summary: It has been working great on my bike for over 3 months now. Longer Version: The left crank on my 20 year old bike used to come loose about every month. The local bike shop said there was nothing I could do but tighten it and the problem would only get worse until I replaced the crank (a $100+ repair and have fun trying to sell an overpriced, unused vintage part on find auction sites). I researched the problem online and came across several mentions of people using Loctite threadlocker to fix the problem. I chose Loctite 243 because it is grease resistant. Unfortunately local stores only sell Loctite 242 (not oil resistant). Revain sells Loctite 243 but through a third party who charges the same shipping cost as the product. Luckily I stumbled across this Permatex threadlocker which is also grease resistant (#24300) and comes with free shipping. My impression is that this is the same product as Loctite 243 but with a new brand. Over 3 months ago I removed the connecting rod and wiped the dirt off both the male and female threads. I applied Permatex to the external threads and screwed the crank back in. I left it without movement for 2 days to allow the material to fully cure. I've been cycling almost every day since then (about 1000 miles total) but the crank won't rev up. I am so impressed with this product that I have decided to use it for other screws that come loose from time to time (like my rear trunk). Everything stayed in its place. If you are unfamiliar with these thread sealants, note that there are several versions of Permatex and Loctite. Blue medium strength material; You must be able to break the seal with the power of hand tools. There is a regular and oil resistant version of the blue material (oil resistant is best if you have a choice). If you need something stronger, there's a red version. You must heat this material with a blowtorch to break the seal. A low strength purple version is also available.