Can I use any silicone lube gel to lube a treadmill deck?

Keeping them leashed and monitoring them on the treadmill at all times will help keep them safe.

Use 100% silicone. It is suitable for the exterior. Many people use kitchen and bath silicone for outside that is not correct.

No. The silicon used for glass is silicon rubber. You need to use silicon oil.

Yes, it is. I recommend getting one with a low pH so the machine does not rust.

I don't think you should use a cast iron pan but it could work if you are desperate. I would definitely use a gas stove.

Yes, as long as you can still cut it to the size you want the mints to be in.

You can use any color. I think black makes the most sense for the fabric because space is black, but feel free to be creative!

The used cards get turned over (do not shuffle). If picking one card at a time, you will have gone through all of the cards already, but if picking three...

Acetone is a possible solution, but be careful of the fumes. Also use a good scraper.