Originally Posted by Type-A
... I also have to get some good silicone to seal up the trim.
Not that you asked...
I would not use any type of silicone seal product.
It can leach onto the roof membrane which may interfere with the bonding of future roof repairs.
Once silicone seals cure there is nothing that will properly bond to them, including more silicone seal. There are effective methods to remove any silicone seals for subsequent repair, but they can be time consuming and sometimes marginally effective. All EPDM roof membrane manufacturers that I'm familiar with specifically recommend avoiding any products which contain silicone.
I would stick with Dicor products because they are readily available at RV stores. Another brand which I wouldn't hesitate to mention is Sikaflex.
I would avoid silicone seal for roof area repairs no matter what the brand name.
My opinion and worth everything that you'll never pay for it.