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local body and paint store recommended this and it is in stock local for me:
https://www.semproducts.com/repair-seam-sealers/1k-seam-sealers
This and the speedkote both claim to be paintable. I suspect they are some flavor of urethane.
found this stuff on ebay and direct from manufacture for those of us with tan trucks:
http://www.speedokote.com/smr-26-beige-fast-setting-auto-body-seam-sealer/
other colors available:
http://www.speedokote.com/seam-seal/
Product cost is reasonable but shipping one tube for $15 sounds high