Which Construction Adhesive (marine-rated) Brand Wins?
We compared 6 construction adhesive (marine-rated) options head to head. 3M came out on top. See the measured results, the runner-up, the budget pick, and a link to the full test video.
F26
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The measured results
Every number below is read straight from the test. Scroll sideways to see all measurements. Products are listed in the order they finished.
| Product | Shear strength (2x4s, lb, 3 samples) | Wood tensile strength (1x2s, lb) | Water-soaked tensile strength (12 hr soak, lb) | PVC tensile strength (lb) |
|---|---|---|---|---|
| 13M Marine Adhesive 5200 | two samples explicitly stated at 1,653 and 1,072 lb (wood failed before the adhesive on both); a third sample's value is never spoken verbatim, but the recap's stated average of 1,363 lb implies a missing middle value of roughly 1,364 lb, kept as a flagged approximation rather than a verbatim figure | 539, 489, 579, average about 536, in a virtual tie with F26's average of about 539 | 392, 382, 402, wood failed (not the adhesive) on all three samples, average 392, the best of all 5 official products and the only one seemingly unaffected by water exposure | 120, 147, 147, average 138 |
| 2F26 | 1,779, 804, 709, average nearly 1,100 lb, a respectable 3rd place finish behind 3M and Red Devil | 574, 610, 433, average 539, in a virtual tie with 3M | 353, 269, 177, average about 266, finished ahead of Flex and Gorilla but well behind 3M | 50, 63, 43, average 52; narrator notes this brand cured fine on wood but did not cure well in the center of the PVC, which hurt its result on this specific test |
| 3Flex Glue | 730, 950, 812, 4th place finish; failed 3 out of 3 times before the wood did | 233, 235, 168, average 212 | 152, 230, 226, average about 203, water exposure clearly hurt this brand's performance | 166, 165, 145, average about 159, the best PVC result of the 5 official (non-bonus) products, better than 3M's 138 |
| 4Gorilla | 574, 977, 735, average 762 lb, 5th (last) of the official products; the transcript introduces this brand's shear-test segment under the name "Weld Bond Heavy Duty Construction Adhesive" rather than "Gorilla," but the recap explicitly states "Gorilla in fifth at 762 lb," an exact match to this section's average, so it is resolved as Gorilla rather than a separate product | 272, 277, 159, average 236 | 269, 172, 153, average about 198 | 93, 107, 140, average about 113 |
| 5Red Devil All Purpose Quick Gripexplicitly called "the least expensive product we're testing," no exact figure given | 1,180, 873, 1,367, average about 1,140 lb, 2nd best shear result of all products, described as "over 200 lb" below 3M's average | 287, 485, 402, average about 391 | 57, 37, 49, average about 48, by far the worst of all products, explicitly expected since this product is not designed for continuous water exposure | 47, 59, 31, average about 46; the two clean numbers (47 and 31) are not directly spoken in this section of the transcript, only "the second was up a little to 59" and a vague "the third was down a little," and are instead recovered from the meta chapter titles "Red Devil: 47 lbs / 21 kg (sample 1)" and "Red Devil: 31 lbs / 14 kg sample 3"; narrator notes this brand, like F26, failed to cure properly in the center of the PVC despite curing fine on wood |
| 6JB Weld | not tested | 619, 718, 747, average about 695; the wood itself failed in all three samples, not the adhesive, so the true strength ceiling was not reached | 400, 493, 469, average about 454; the wood failed in all three samples again | 404, 247, 461, average about 371, more than double the next best official product's PVC result |
How it was tested
- shear strength using glued 2x4 lumber pulled apart under tension (lb), 3 samples per product
- tensile strength using glued 1x2 lumber pieces (lb), 3 samples per product, cured 8 days
- tensile strength using the same 1x2 wood samples after 12 hours of continuous water soaking (lb), 3 samples per product
- tensile strength bonding smooth PVC end caps (lb), 3 samples per product, cured 8 days
“So, which construction adhesive won this showdown? Definitely 3M 5200. It wasn't even close.”
Data notes and caveats
This is explicitly part 1 of a 2-part construction adhesive series; this video covers only marine/waterproof-exposure-rated products (F26, Flex Glue, Gorilla, 3M 5200, plus not-marine-rated Red Devil as a comparison point and JB Weld as an unofficial bonus entry). The video description states a second video will cover Liquid Nails Heavy Duty, Liquid Nails Fuze It, Loctite PL 8X, Loctite PL 3X, and DAP Dyna Grip; that is presumably a separate videoId elsewhere in this corpus. Meta chapters were directly useful for recovering Red Devil's PVC-test sample 1 and sample 3 values (47 lb and 31 lb), which were not clearly spoken in the transcript. All per-sample numbers cross-check cleanly against the video's own spoken recap averages for every product except a single missing middle value for 3M's shear-strength test, which is only recoverable as an approximation via the stated overall average. No exact dollar prices were ever spoken for any of the 6 products; only relative cost framing (Red Devil called the least expensive; F26 delivers about 11 lb of strength per penny versus 3M's 5 lb per penny).