I bought some two part schutz gun gravel guard for the bottom 10 inches of a 2004 Tacoma that is extremely strong. I'm at home now but I can find out what I bought in the morning plus I have the Tacoma on my lift so I can shoot pics of how it came out. It's been on there for 26 months. Nov of 2023.
Given it's two part I did not seal it and I sprayed BC/CC over it.
The Gravitex and Wurth stuff is not two part.
I know nothing about bed liner.
Found some pics on my phone. I'll find the product name tomorrow.