Tell us about yourself!
I'm going to build a similar device using a toilet paper tube to keep my car keys in. This is to prevent thieves with RF amplifiers from using the keyless door locks and igintion. I'll follow up and let you know how it worked.
Your key fob transponds with your car to authenticate and open doors or turn on ignition. It only works a few feet away usually. If thieves use an amplifier they can make the signals more powerful so they can connect the key fob on your nightstand connect with the car as if you were close. They can then start it (once) and drive away while you sleep. If your key fob is in a Faraday cage they can't get to it.
As far as prolonged exposure...I cleaned safe deposit vaults at banks with WD-40 (we bought by the gallon) and microfiber cloths for 10 years with no harm done to my skin. Worst part was if you didn't wash well enough after it could make your hamburger taste a bit funny.
Another great use for WD-40. If your lawn mower or other engine won't start, spray a bit of WD in the carburetor intake. It's flammable and lubricates too. If the engine starts you have a fuel problem. If it doesn't you have an ignition problem and it won't wash off the lube from the rings like using straight gasoline in the carb.
Trying to be nice but it seems there is some wood missing from your parts list.
If you have a rice cooker (Asians and Cajuns know all about them) you just put in the amount of water for rice, put eggs in steamer basket and hit GO. I'll have to try the ice bath but mine have not been hard to peel. I do them the night before so they'll be ready for breakfast.