Sure would make the effort to row the thing greater. These linings are indestructable for sure, but they also are not a smooth finish. They have a texture which will create drag in the water. That much texture would be a noticeable amount of drag. I would re-glass it, even add another layer of some heavy woven mat as well for protection.

Then again, what the hell do I know.......
_________________________
Organized people are just too lazy to look for things.