Durabak and Herculiner are not related.

One gallon of Durabak will get you a slip resistant surface, but it won't get you a "bedliner". In addition, about 25% (actually, it's 24.27%) of that gallon can is xylene which is a solvent that evaporates away. So, for every gallon you buy, you're getting 3/4 of a gallon of actual bedliner material.

Just to compare (yes, I realize the thread is about DIY bedliners!), LINE-X installs about 8 gallons, solvent free.

 

I had good luck with Grizzly Grip (www.grizzlygrip.com). As others have stated prep is important. I ordred the 8' bed kit for my 6.5' box and put it on thick. The directins mention that thickness = durability. I abused it pretty hard over the summer hauling away some busted up cement and bricks. There were a few small nicks where the corner of a large piece of concrete landed. I'll probably get another quart of material eventually and touch it up, but it's hardly enough to worry about.

I also couldn't justify spending $600-$700 for a spray on liner for a 5 year old truck. If I can do the job for ~$125 and get the protection I need I think it's a good deal.

 

I have used Dupli-Color Bed Armor DIY Truck Bed Liner Kit for my truck. It offers impact resistance, flexibility, and superior adhesion. It is also contains dupont kevlar. You can easily clean-up and re-used this bed liner kit.

 

Here's a screenshot from Bed Armor's video. Those are clumps of Kevlar that probably do NOTHING for the bedliner. It's just marketing...

 

My '77 has had a "under lip" drop in for 30 plus years, I've only replated the floor with 11 gage steel one time in early 1990s as I recall.



I do have a fiberglass bodied 3x5 cargo trailer that tows behind a MC or our Trike that the top side flaked paint off of and I am going to scuff all remains off & do with Herculiner I think (used "bed armour" in my '77s floor .... came out spotty like in consistency of granules?) ...... as the heaviest use will be laying a jackets or helmets on it at rest stops likely.

 

Gonna buy a gallon of the Harbor Freight stuff tomorrow.