best glue for resin

Some resins are really hard to clean. Soap and water often fails to do the job for me. I use 91% ISO alcohol. Also, you'll need to use super glue (CA) or two-part epoxy. If you are going to be putting any stress on the parts during construction, like sanding heavily or pressing them into place, I suggest using two-part epoxy. It sounds like a lot of hassle, but you can squirt a drop of each part on a piece of plastic and mix them pretty quickly. Barrett

Dish soap and warm water. It's CMK, and I have never had a problem with their stuff having oil on it, but washing it cannot hurt.

Then use CA (superglue).