Hola. First of all, the silver paint must be placed exact where the peeled one inch red cable will be touching the diaphragm. No other coating must be use. The diaphragm is an atom level vapor deposited with a special adhesive. There is no way, unless you use the same way, to make this plastic diaphragm to be conductive again. If you use a different material, conductive way to make it to sing again, you might change their sound and efficiency. On the other hand, If you decided to buy, you get two brand new panels, and also you get, from their serial number, the five year Martin Logan warranty. If any problem arise with those panels, the factory will replace them free of charge. On the other hand, yes, it is expensive. Also, you are right. The speakers are 21 years old. It is time to think to replace them or re-panel them. Just my thoughts: I will have again, the sound of my Aerius as new! Will have a warranty with the same as a brand new product for the panels only. Difficult decision. Happy listening.