Looking for right angle molding to seal tD

Hi all,
Im starting a new build tomorrow(once i finish cleaning out the garage). With this one im not doing the "woody" finish instead im going to use
The basic construction will be 3/4" plywood for sides, and deck. I plan on covering roof with FRP and the sides with Polywall panel. My question is i would like a flexable, cheap material to enclose the poly and frp where they join.
I have hunted at lowes and homedepot, but cant seem to find anything that is flexable, that i can glue/nail/cock at the joining seem.
what are your ideas?
Im starting a new build tomorrow(once i finish cleaning out the garage). With this one im not doing the "woody" finish instead im going to use
The basic construction will be 3/4" plywood for sides, and deck. I plan on covering roof with FRP and the sides with Polywall panel. My question is i would like a flexable, cheap material to enclose the poly and frp where they join.
I have hunted at lowes and homedepot, but cant seem to find anything that is flexable, that i can glue/nail/cock at the joining seem.
what are your ideas?