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The application sharing mechanism in multi application smart cards facilitates corroborative schemes between applications in a secure and reliable manner. Traditional application sharing can only be realised if both applications are installed on the same device. In this paper, we extend the smart card firewall to include the application sharing mechanism between applications installed on different smart cards. We propose Platform and Application Binding Protocols that enables two smart-cards / applications to authenticate and ascertain the trustworthiness before sharing resources. Furthermore, we provide an informal analysis of the protocols along with comparison with existing protocols. Subsequently, mechanical formal analysis based on the CasperFDR, and the implementation experience is presented.