Spray paint upholstery? Oh my...
Enamel Painted Vases - Easy and Beautiful
Enamel Painted Vases - Paint used was PermEnamel paint in Mediterranean Blue and White (or whatever color you prefer), PermEnamel Surface Conditioner from Michael's. Full Step-by-Step Tutorial.
How to paint upholstery.. there are a lot of methods to do this, but using fabric medium will give you the softest final result.