Just another opinion here. Degrease it with any or all of the methods above except the oven. Another option is K2R spot lifter. It does a great job removing oil from stocks. An oven is too dry (humidity) imo. CA/superglue is very brittle and imo not a good choice based on 40 years of gun work and over 50 years building flying model airplanes. A very thin epoxy like WEST or Z Poxy finishing resin will seep and migrate much better than craft store epoxies. Z Poxy is a 30 minute cure and WEST can be 8 hour or longer cure. I agree that thinning with solvents will weaken epoxies but either of these can be heated in a water bath to 120-130 degrees F to reduce viscosity without damage. The cure times will not be affected much but pot life will be greatly reduced. That's because once it goes into a thin film it assumes the temperature of the surrounding material. I also concur that the cause for the cracking should be determined to prevent it recurring.