When I saw it, I initially thought "Group Buy" flares and the first pictures looked like surface rust. Brant thought the same thing.
The GRP thing hit me later after I sent the initial PM. The "no cracks" comment also had me thinking...
I think GRP is a more common name for Fiberglass in the European market. I see the folks from the UK use it all the time. Here we call it... (wait for it) fiberglass.
I changed the thread title and the details we changed by the seller so it's pretty clear now.