bedliner on my undercarrage ?

I'm planning on bed liner over epoxy primer and seam sealer on the underside of my '41 Chevy. Has anybody tried "Monstaliner"?

 

We had Superliner(.com) sprayed under the fenders on the 32 AND on the runningboards. Offered in 3 finishes, we used the "gloss" which has a finer texture and smoother surface and works great as runningboard "covers". They show no wear after the last 3 years and some 5K miles.