West System 655-8 G/flex Epoxy Adhesive, two 4.5 fl oz., White

I do alot of custom fabrication, mostly on custom cars. This is one of my favorite tools for bonding, sculpting, and finishing. It holds a decent shape before curing, and cures so great - strong - and shapable (is that a word?) I don't write reviews, but G/Flex deserves a bit of my time to give it a big thumbs-up

I bought a trailer and found there was a crack in the black tank, desperate to not replace the black tank I spent hours researching. I stumbled upon this product, after seeing a guy use this who put a jack through his black tank and patched much more severe damage than mine, I decided to pull the trigger. The difficult thing about my tank is it is polyethylene, which many products don't adhere to. This will work on both abs and polyurethane. MAKE SURE YOU READ THE INSTRUCTIONS. I cleaned the outside of the tank with you isopropyl alcohol multiple times using paper towels as recommended (rags may have softener which will affect its ability to stick), flushed the black tank multiple times, sanded with 80 grit sand paper everywhere I was going to apply, I then cleaned with more alcohol. Then the important step for polyethylene, flame treat the plastic, which is just running fire quickly over the surface, not melting the surface but chemically changing the surface. I then applied a thick layer in the crack, getting as much in as possible. I spread it wider placed some fiberglass mesh in it. Here is where I "messed up", after the first layer I thought it was a good idea to wait a day to apply the second layer. That night after googling and going to their website, they recommended thick layers, which generate heat and help it to cure. They also recommend waiting 3 to 4 hours only before applying the second layer (push your thumb into it, if it is still soft, but doesn't stick to you, you're good to apply the second layer. So after waiting two days, I had to 80 grit sand the epoxy , clean with alcohol again, flame treat and then apply the second layer. After letting it cure for a few days I put 30 gallons in to test the patch. Not a drop. Time will tell how it will hold up with movement and flex, but I'm pretty confident I'm good for quite a while.

This worked on polyethylene after flame treatment. NOTHING else did. This is a great product!

Amazing product my plastic boat is fixed good as new

I've been using this to patch small cracks and spider cracks in the transom of my 1970's fiberglass boat. It's easy to mix up and thick enough to apply upside down on the bottom of the boat *without* having to let it set up (semi cure) or mix with fillers like sawdust to make "peanut butter". It's already thick enough (even in a hot Arizona garage) and sticky. I apply it with a plastic mixing stick after opening up the cracks with a dremel. It seems like the perfect toughness after curing. Not too brittle and not too flexible. It should flex with my old "wet noodle" hull and not crack again. It sticks to anything and self levels itself while applying to make a smooth repair. After curing it is so clear it looks like there is nothing in the cracks, which is funny.

Definitely agree with other reviews ~ This product is Great!!!!. I used it to fix a Crack in my RV Motorhome water tank. 5 Star recommend

I looked all over for something that works. Saw another review that seemed promising. Just like the other reviewer the trailer manufacturer did not add a support for the clean out which caused it to vibrate and eventually cracked the black water tank. Took some time prepping by cleaning the inside of the tank, let dry by using a leaf blower in the toilet and let dry for a week. Then I scuffed the tank with 100grit and cleaned with running alcohol. Oh I also heated with a hand held torch to get better adhesion. Once all that was done I added a thin layer to the crack trying to force some inside. Next day i applied. Supper easy to mix. Added fiberglass mesh tape to provide even stronger support. Prep is the key.....and fix the problem that caused it in the first place.

holds great but dries snot yellow brown I thought it would dry white does not stink got like that recomend roughing up what ever glueing with sand paper.