Went by the auto paint store and got some 3M plastic repair epoxy.

I glob'd it into the corner wet with small plastic knife.
After about 5mins it sets up to the constancy of old chewing gum stuck
under a desk.
You have about another 10mins to lightly mold it with your finger tips
or end of plastic knife or whatever.
Waiting for it to cure now to see how it bonds and sands.
The cured sample at the store looked and felt just like hard plastic.
First test corner
2002 Tahoe 4.8 - soon to be turbo'd - SOLD
1989 Mustang - LX Vert - 351W-TT - 2inches of dust covering it
2012 Raptor - 497rwhp at 10psi
If you aint breaking - you aint going fast enough