does anyone know "for certain" the type of plastic used in the construction of our rear spoilers?

 

Usually it is ABS plastic, I cannot recall any manufacturer using FRP for OEM spoilers.

 

Why do you ask? What are you trying to do/find out?

 

...to find the appropriate adhesive/filler. i've got some small splits to repair in one spolier and am wodering if some pretty good damge in another can be repaired.

 

Any good auto fiberglass with the proper resin will do the trick. When Ptatohed had his body work done, I cut off the middle legs of his spoiler and his brother (a bodyshop technician) fiberglassed the holes closed. Came out just fine.

If you're looking for a place to start, try PM'ng Ptatohed. I believe he kept the packages/containers for reference.