Hi Chuck -- thank you for reaching out. On this page, there is a PDF titled "Grace Bituthene 3000 Below Grade Waterproofing" which covers the priming necessary. Regarding the FLEX-PASTE, our recommendation is to speak directly with GCP customer service. They can be reached at (866) 333-3726.
As always, please be sure to to be aware of and follow all local and state building codes. Best of luck!