The stick products are stiffer than the tub products. As a result, they are harder to mix and slightly more difficult to get a good bond, but they are superior for stopping an active leak. The tested stick products permanently stopped the 1/8-inch saw cut leak within moments, while none of the tub products held for more than a few minutes.

1. Sudbury Wet or Dry Epoxy blows out (top), but JB WaterWeld holds tight.



2. Products packaged in tubs bond well but lack the stiffness to stay put under pressure..



3. Fiberglass samples were soaked for several weeks before bonding.



4. This Star brite sample undergoes shear testing. The epoxies were allowed to cure for 48 hours before shear testing.



5. Testers apply pressure to wet fiberglass bonded with Total Boat Underwater Epoxy. Lapping over screw holes creates a mechanical hook.