Only time I have seen bed liner used on the bottom of a water vessel was about fifteen years ago. Working for the fire department we were given two PWC. They were nice! This set forth a complete training and certification program for water rescue personnel.
With that being said, after a few minor scuffles during training, one of the initial instructors got a local bed liner company to line the hulls of the PWC with bed liner for free!
With out the approval of his superiors or the vehicle maintenance shop, the PWC's were taken out of service and bed liner applied!
WOW,, it looked awful! Imagine a brightly colored fire rescue PWC with a Black bed liner half way down the hull?
Then,, the weight made the biked sit allot lower in the water, they were slower because the surface is very rough.
The idea on pen and paper sounded ok, but in reality,, it was not a viable option! Unless you could get it in a very smooth application, the resistance and weight will hamper the hull design and performance!
When the PWC dealer that loaned the PWC for free found out what happened they took the PWC back because that voided the warranty!
So needless to say,,, the PWC water rescue program came to an abrupt end!