I'm familiar with Linex, and that would be very hard, and no flexibility at all. I believe it would crack terribly when it flexed, or you walked on the roof. It would also rip up your knees if you had to kneel down on it to work on something. I've never seen Herculiner in person, so I can't help with that brand. I do know they're both great truck bedliners.
Every day's a learning experience, though sometimes not what we expected.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
1 Spoiled Dog