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If you are starting with dry upholstery, you will want to get it damp before beginning-equal parts paint, textile medium, and water in a pint jar. If your paint is really thick you might need to add more water until it's about the consistency of a glaze.
Take a Seat Drive through any neighborhood on trash day and you're sure to find a beat-up chair or two. Rescue the sturdy ones with sandpaper, primer, and paint. Re-cover the seat by cutting fabric 3 inches larger all around and attaching it with a staple gun. For extra flair, embellish the chair back with rub-on lettering.