Durabak vs Herculiner vs Raptor & Others: Durabak Bed Liner Beats 9 Competitors in a 6-Point Matchup
Project Farm, an independent YouTube channel, bought ten roll-on bed liners and ran the same six physical tests on identical steel panels: cold impact, ambient impact, adhesion, chemical soak, scratch, and a falling-object drop. Durabak won the showdown. It posted the strongest adhesion in the field by a wide margin (595 lb on bare steel, 641 lb primered), was not penetrated on either the ambient-temperature impact (first) or the falling-object drop (tied for first), and finished second on cold impact at 1.34 mm.
Source: Project Farm. Ten roll-on bed liners, identical panels, six physical tests, every coating run through the same procedure. Watch the full test below.
Watch the full test on YouTube
| Brand | Cold impact (mm) | Ambient impact (mm) | Adhesion bare / primered (lb) | Alcohol | Gasoline | Diesel | Scratch | Drop (mm) |
|---|---|---|---|---|---|---|---|---|
| Durabak | 1.34 mm 2nd | Did not penetrate 1st | 595 / 641 1st | Beginning to break down | No problem | Did just fine | Category 2 | Did not penetrate 1st |
| Herculiner | Did not fully penetrate 1st | Penetrated 3rd | 433 / 612 2nd | Beginning to break down | No visible damage | Held up very well | Category 2 | Did not fully penetrate 1st |
| U-POL Raptor | 5.12 mm | 3.2 mm | 48 / 425 4th | Not tested. | Did not cause any damage | Held up very well | Category 2 | 3.94 mm |
| POR-15 | 9.74 mm | 1.5 mm 4th | 41 / 157 | Beginning to break down | Peeled away | No issues | Category 2 | 6.18 mm |
| Rust-Oleum | 8.15 mm | 6.35 mm | 48 / 89 | No damage | Held up just fine | Held up well | Category 2 | 5.35 mm |
| Iron Armor | 9.09 mm | 9.42 mm | 47 / 281 5th | Broke down and came loose | Did not hold up well | Broke down | Fairly deep scratch | 5.91 mm |
| Dupli-Color (Bed Armor) | 5.54 mm | 3.21 mm | 72 / 42 | Peeled away | Tolerated just fine | Did just fine | Cut all the way through | 3.1 mm 5th |
| Flex Seal | 2.16 mm 3rd | 3.23 mm | 366 / 491 3rd | Quickly peeled away | Peeling away | Just fine | Cut right through | 2.79 mm 4th |
* Results from Project Farm's independent roll-on bed liner test (watch the full test). Superscript figures are Project Farm's own stated rankings; it ranked only the top three to five coatings per test and reported several of the best results qualitatively ("did not penetrate," with no millimeter reading), so the rankings are its stated calls, not a sort of the numbers in this table.
How did the bed liners handle a minus 40 F impact?
Project Farm chilled every panel overnight at minus 40 F, then hit each one with a .177 caliber steel ball traveling more than 200 mph and measured the diameter of the damaged area. Herculiner came first (the ball did not fully penetrate), Durabak second at 1.34 mm, Flex Seal third. This was the one test Durabak did not win: Durabak vs Herculiner in the freezer came down to Herculiner's no-penetration result against Durabak's measured 1.34 mm. One honest footnote to the whole freezer round: several coatings actually showed more damage than the bare, uncoated reference panel, a reminder that deep cold changes how these films absorb a hit.
How did the bed liners handle a room-temperature impact?
The same steel-ball impact at about 75 F told a different story. Durabak came first because it was not penetrated, Herculiner placed third (it softened just enough for the ball to break through), and POR-15 came fourth at 1.5 mm. Here U-POL Raptor showed its limit against the leader: Durabak was not penetrated at all, while U-POL Raptor recorded 3.2 mm of damage.
Which bed liner sticks to the metal best?
Project Farm cured each coating on bare and primed steel cubes for 15 days, pulled them apart, and recorded the force in pounds. This is the test that decides whether a liner stays on the truck, and it is where the head-to-head matchups are most lopsided. Durabak led the entire field by a wide margin at 595 lb on bare steel and 641 lb primered. Durabak vs Herculiner: 595 / 641 against Herculiner's 433 / 612, Durabak first by far and Herculiner second. Durabak vs Raptor: U-POL Raptor let go at just 48 lb on bare steel (425 lb once primed) and ranked fourth. Herculiner vs Raptor on the same pull test: Herculiner's 433 lb on bare metal nearly matched Durabak and far outpaced U-POL Raptor's 48 lb.
How did the bed liners resist alcohol, gasoline, and diesel?
Project Farm soaked coated washers for about 90 minutes in rubbing alcohol, non-ethanol gasoline, and diesel, and described each result in plain language with no score. Diesel was the gentlest on the field and Durabak did just fine; gasoline gave Durabak no problem. Rubbing alcohol was the harshest chemical for almost everyone, and Durabak began to break down, as did Herculiner and POR-15, while several budget coatings peeled outright. Project Farm did not test U-POL Raptor in rubbing alcohol, so the table marks that one cell not tested rather than guess a result. Because Project Farm gave the chemical soak no ranking, the table bolds no winner in these three columns.
Which bed liner resists scratches best?
Project Farm dragged a screw loaded with about two pounds of force across each coating and sorted the field into four categories, one being best. Durabak landed in the Category 2 group alongside most of the established name-brand coatings. The softest products were left uncategorized because the screw cut clean through them.
How did the bed liners handle a dropped steel weight?
Project Farm dropped a 500-gram steel rod 24 inches onto each coating and measured the damage. Herculiner and Durabak tied for first because neither was penetrated. Durabak held the line against U-POL Raptor once more: Durabak was not penetrated, while U-POL Raptor recorded 3.94 mm.
What was Project Farm's verdict?
Project Farm's own conclusion was direct. In the host's words, "Durabak definitely won the showdown." The channel also gave a nod to Herculiner, and said it would use U-POL Raptor as well.
How does Durabak hold up to UV and sun exposure?
Project Farm's six tests measured impact, adhesion, chemical resistance, and abrasion. None of them tested sunlight. For anything that lives outdoors, a boat deck, a trailer, an exposed truck bed, here is what is known about Durabak under UV and weather, kept separate from the Project Farm results above.
There is also a chemistry difference worth knowing. Herculiner is built on aromatic polyurethane (MDI, per its own safety data sheet), the chemistry class that tends to chalk and yellow under prolonged sun. The Durabak-18 Outdoor grade used for exposed surfaces is an aliphatic polyurethane (IPDI, per Durabak's Outdoor/UV safety data sheet), the class formulated to hold its surface under UV.
Durabak's manufacturer states a service life of 10 to 15 years. That is a manufacturer statement, not an independent test result.
On the choice between Durabak and Monstaliner, the clearest difference is on application day: Durabak is a one-part coating that rolls on with no mixing, while two-part kits like Raptor and Monstaliner must be mixed before use. On measured performance, Durabak has the independent Project Farm results shown above.
If appearance under sun matters for your project, the smooth grade gives a cleaner finish than the textured one; see the smooth Durabak Outdoor option for color choices.
Why do roll-on bed liners peel?
Roll-on bed liners peel when their bond to the metal fails, which is why adhesion is the number that matters most. Project Farm cured each coating on bare and primed steel for 15 days, then pulled the pieces apart to measure that bond in pounds. Durabak held the strongest grip in the field by a wide margin: 595 pounds on bare steel and 641 pounds primered. For comparison, U-POL Raptor let go at just 48 pounds on bare steel (425 primered) and Herculiner pulled 433 pounds bare (612 primered). The liner with the weakest bare-metal bond is the one most likely to lift and peel at the edges later. Bond strength also depends on the metal being clean and properly prepped before the coating goes down, since even the strongest coating cannot grip oil, dust, or loose rust.
Can you install Durabak yourself, without a professional?
Yes. Durabak is a one-part coating that rolls on straight from the can with no mixing, which makes it one of the more forgiving liners to apply yourself. Two-part kits like U-POL Raptor and Monstaliner have to be mixed before use, which starts a working-time clock and leaves room for mix-ratio mistakes. With a one-part roll-on there's no mixing and no mix-ratio to get wrong: you prep the metal, then roll on thin coats. One gallon covers about 60 square feet textured or 75 square feet smooth at two coats, so a single truck bed is usually a one-gallon job.
What does each bed liner cost per truck bed?
For a standard truck bed of about 50 square feet, every one of these liners is roughly a one-gallon job, so the price of a gallon is close to the price of the finished bed. Durabak covers about 60 square feet per gallon textured at two coats because it lays a thicker film, roughly 29 to 39 mils dry, per the Outdoor/UV technical data sheet. A liner that lists higher coverage per gallon is laying a thinner film, which is a different build rather than a better value.
| Bed liner | Cost per standard truck bed (about 50 sq ft) |
|---|---|
| Raptor (U-POL) | $142.99 |
| Herculiner | $155.99 |
| Durabak (textured) | $159.95 |
| POR-15 | $175.36 |
Prices are current US retail for one-gallon kits as of July 2026.
Durabak and Herculiner sit close on price, and Durabak leads Herculiner on the independent bed-liner test results shown above.
What do Durabak's abrasion, flexibility, and salt-water tests show?
Beyond the independent Project Farm results above, Durabak publishes its own ASTM-method test data on the Outdoor/UV technical data sheet, which covers the outdoor and around-water properties Project Farm did not measure. These are manufacturer figures, each tied to its test method, and they are listed separately from the Project Farm results.
| Property | Result | Test method |
|---|---|---|
| Abrasion resistance | 30.5 mg weight loss (1000 g load, 1000 cycles) | ASTM D4060 |
| Flexibility (elongation at break) | 497 percent | ASTM D2370 |
| Mandrel bend, 1/8 inch | No cracking | ASTM D522 |
| Slip resistance, textured | Static coefficient of friction 0.95 to 0.98 dry, 1.41 wet | ASTM D1894 |
| Salt-spray exposure | No effect | ASTM B-117 |
| Water immersion, 7 days | No effect | ASTM D1308 |
| Service temperature | -60 F to 254 F | Thermal cycling |
What are Durabak's coverage, colors, and specs?
Durabak has been manufactured in the United States since 1996. One gallon covers roughly 60 square feet textured or 75 square feet smooth at two coats, building a finished film of about 29 to 39 mils, per the Outdoor/UV technical data sheet. It is a high-solids coating at 75.8 percent solids by volume, and it bonds to steel, aluminum, concrete, wood, and fiberglass. It comes in 16 textured and 15 smooth colors. Beyond the Project Farm test, Durabak carries a large body of verified Okendo customer reviews.
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