This stuff? 8463 3M
https://www.3m.com/3M/en_US/company-...3193646&rt=rud
The other formula (8458) they make is a rigid design for door pillars and other internal applications.
https://www.3m.com/3M/en_US/company-...3194025&rt=rud
Added problem is that you have to buy their applicator gun and tips...more money!