Thanks for the suggestions, I'll look into them.
Would Danish oil work in this situation, as I have some in the garage? Though, I don't want to apply something that will rub off when the chairs are being used.
I have a set of dining room chairs made of ash. They have some watermarks and other unidentified marks on them but generally, they just need a bit of tidying up and re-upholstering. I'm planning to give them a light sanding and then coat them with something. I was wondering what the best finish...