I have a 1900 house with a field stone foundation. The foundation is in good shape. There is minimal moisture. I want to paint the walls to make it look nicer. What kind of paint should I be using? I will be spraying on.
"Painting a stone wall to make it look nicer" is "good" for a few months, perhaps. Forever after, it's a mess.
Stone walls don't need paint, don't benefit from paint, and look like [bleep] when the paint peels. Removing the parts of the paint that don't peel is difficult, so they look like [bleep] ever after.
Don't go down this road. Your house will look much better, as it has for 117 years.
I totally agree with Ecnerwal. However, if you insist, there is a primer called masonry primer, or concrete bonding primer. It can be sprayed with a pretty open tip, just see what the label suggests. That will allow you to topcoat with any exterior latex you should choose.