Glues, conductive paint, epoxy coatings.... none of them work for long. Over 3 decades in the repair business, I've fixed countless buttons and tried every solution out there. With an extended warranty I needed something that lasts. Membrane keypads are the only solution that works but until now they required complicated setup and large minimum order quantities. Introducing universal membrane repair buttons. Available in several sizes these can be used to PERMANENTLY repair virtually any rubber switch. Cordless phones, TV remotes, credit card terminals, industrial machines... any rubber keypad that uses silver or carbon conductive contacts. (Not for use with metal snap domes. )
https://p1repair.com