It is possible to repair dope with Stewart Systems. The biggest concern is the adhesion of the old dope. Our products will stick to the dope, but will the dope stay adhered to the surface. In our manual we require that the dope is removed to the silver only where the glue joint will be if you are patching. For cracked areas of dope, the best way to repair that is to brush EkoFill up under the old dope as best you can. Then after it is dried, feather it out with sand paper. Then you can paint over it with EkoPoly Premium, or the original dope.
Andy