If the paint job was done when there was an existing partnership (and out of the partnership) where this business partnership gave an express warranty to one of its customers who is now not pleased with the result, you and the other partner are each individually responsible to make good on your express warranty even though the partnership was dissolved.The only exception is if the painting was done more than four (4) years ago where if so, any claim for breach of the warranty would most likely be barred by your state's statute of limitations.