I hate Marine Tex! (rant)

Boomyal

Supreme Mariner
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Aug 16, 2003
Messages
12,072
Out of all the different stuff I've been using, Marine Tex, is by far, the most expensive, the messiest and the hardest to mix in small quantities. Anyway, at least I hope it is as tough as it is messy. It is almost impossible to mix accurately in small quantities. I hope this tank repair cures. After patching the corrosion pits I will sand them down and paint the tank with what? Liquid Marine Tex. Hope it's not as messy.<br /><br />
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Winger Ed.

Chief Petty Officer
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Mar 24, 2004
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649
Re: I hate Marine Tex! (rant)

Wow. You didn't mix that stuff for each hole one at a time did ya?<br /><br />First before we go on-- <br />Take a deep breath, let it out slowly, and say, "Marine-Tex is is my friend. Together, we can many good things". <br /><br /><br />Its a little late now, but you could have covered it with a layer of cloth and that new generation epoxy resin. They make gas tanks out of it for applications where the 'plastic' ones can't take the vibration, like for a motorcycle.<br /><br />I did that on a steel tank that was just rotten on the bottom back in the early 90's. I couldn't replace it, so I had to fix it. And the A & B type fiberglass/epoxy resin did a good job with one layer of mat.<br /><br /><br />Something else that will work for what you're doing is JB Weld. Any auto parts store has it. It comes in two little tubes, is easy to mix in small amounts, and is even available in different drying speeds. For its volume, it works out to be about the same price as Marine-Tex.... especially if you don't have to drive as far to get it..<br /><br />I repaired a 1/4 inch hold in the bottom corner of the gas tank for a '55 Ford pickup with it once. It was still holding 10 years later when I sold the truck.<br /><br />Not to add to your misery, but on a tank that bad,,, you might want to check into some of the chemicals they have nowdays to line the inside with in case it tries to eat new holes, or corrode around your patches.<br /><br />Any hot rod magazine has ads for it. All them guys using gas tanks from the 1930's or so are a natural market for the stuff.<br /><br />As far as painting it goes-<br />If it was me, I'd hose it off with 2-3 coats of a good 2 part epoxy Chromate primer first.<br /><br />If the holes were caused by rubbing, maybe paint it with a good heavy coat of that $30. a quart truck bed liner goop after it was primed. If the rot was caused by water laying on it all the time, I'd figure some way to keep the outside/bottom of it ventilated and dry.<br /><br /><br />Oh:<br /><br />Using a slicked out '65-68 antique Mustang for a workbench like you're doing, may cost you your place in Heaven too.
 

crab bait

Captain
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Feb 5, 2002
Messages
3,831
Re: I hate Marine Tex! (rant)

good post ED..<br /><br />just remember DON'T FOAM in the tank..!!when you go to install.. must have ventilation all around it .. or you'll have major condensation ( water gas ) problem..
 

Ralph 123

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Jun 24, 2003
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3,983
Re: I hate Marine Tex! (rant)

Hey Boomyal my friend, what year is that Mustang you are using as a WORK BENCH :)
 

KaGee

Admiral
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Aug 14, 2004
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7,069
Re: I hate Marine Tex! (rant)

So ya like a little metal to go with that Marine Tex fuel tank.... (snick) ;)
 

G DANE

Commander
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Nov 24, 2001
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2,476
Re: I hate Marine Tex! (rant)

I did exactly waht Ed tells and I can recommend it. I had a 21' daycruiser and salt water in the bilge corroded small holes in the aluminium tank. I sanded it, primes it with a priming acid and alyed 2 layers of mat and epoxy. Never leaked again - easy and cheap fix compared to buying a new tank. I did in fact boat a month or thw with 1 gall's fuel in the bilge - couldnt figure is was that smelly. Even used the open fire stove :eek: Think of what could have happened !!
 

18rabbit

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Nov 14, 2003
Messages
3,202
Re: I hate Marine Tex! (rant)

Aluminum and epoxy have an affinity for each other. As I noted in your previous post (CPES), when you apply the first coat of epoxy wet sand the aluminum using thinned epoxy. Sanding cuts the oxidation on the aluminum and the epoxy keeps the air off it. Let it dry, the aluminum partials in the epoxy won’t hurt anything. Apply a normal second coat of epoxy or as G Dane points out, toss in a couple wraps of cloth. As long as you keep the fill port and vent port dry you can foam that critter in and never worry about corrosion. I would not coat the inside of the tank. It’s probably discolored but the metal should still be smooth.<br /><br />Btw, how did you get those cars in your office? :)
 

Boomyal

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Aug 16, 2003
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Re: I hate Marine Tex! (rant)

Originally posted by KaGee:<br /> So ya like a little metal to go with that Marine Tex fuel tank.... (snick) ;)
Hey, gimme a break. :D There were no leaks in it, just a bunch of sharp little pock marks about half way through the metal. It's like there were soft spots in the aluminum sheet that were more sucesptable to corrosion.<br /><br />RALPH, it's a '65 convertible that I restored back in the early/mid '80's.<br /><br />
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<br /><br />WingerEd, several of you are recommending to glass cover the tank. I could do that with the Liquid Marine Tex, but considering the tank lasted 29 years, I think that the LMT coating plus my new drainage system should suffice. I didn't use JB Weld (old friend) because the 2 types of Marine Tex are supposed to be more flexible.<br /><br />18R, you are correct re the inside of the tank. It is a uniform bronze color with no sign corrosion. That sounds real messy, sanding the tank with thinned epoxy. Yuk!<br /><br />GDANE, glad you're still with us! A gallon of gas under the floor? Whew!
 

Ralph 123

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Jun 24, 2003
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3,983
Re: I hate Marine Tex! (rant)

Sweet! - One of my all time favorites! And, as you've shown it makes one heck of a WORKBENCH! ;)
 

Boomyal

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Aug 16, 2003
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12,072
Re: I hate Marine Tex! (rant)

Originally posted by Ralph:<br /> Sweet! - One of my all time favorites! And, as you've shown it makes one heck of a WORKBENCH! ;)
Isn't that why you'd have a classic car in your garage? Not real good for anything else. I'm afraid to drive it! ;)
 

jsfinn

Lieutenant Junior Grade
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Nov 26, 2003
Messages
1,093
Re: I hate Marine Tex! (rant)

Boomyal! You're killin me!! Work bench?! I'll be right over to haul that "Work bench" away! :)
 

KaGee

Admiral
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Aug 14, 2004
Messages
7,069
Re: I hate Marine Tex! (rant)

That was my "dream car" when I was in High School. So many of them were rust buckets around here due to the salt and the crappy way cars were made back at the time.
 

18rabbit

Captain
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Nov 14, 2003
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3,202
Re: I hate Marine Tex! (rant)

Boomyal – I saw this in the back of a West Systems product guide:<br /><br />860 Aluminum Etch Kit<br />A two-part treatment for preparation of aluminum surfaces for bonding with epoxy. Our research shows adhesion to aluminum is significantly improved with this process. Also improves paint adhesion.<br /><br />I know nothing about the product but maybe it will help MarineTex (the stuff you hate) adhere to your fuel tank. MarineTex is epoxy, too. Then again, it might be vinegar.
 

Boomyal

Supreme Mariner
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Aug 16, 2003
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12,072
Re: I hate Marine Tex! (rant)

Originally posted by 18rabbit:<br /> Boomyal – I saw this in the back of a West Systems product guide:<br /><br />860 Aluminum Etch Kit<br />A two-part treatment for preparation of aluminum surfaces for bonding with epoxy. Our research shows adhesion to aluminum is significantly improved with this process. Also improves paint adhesion.<br /><br />I know nothing about the product but maybe it will help MarineTex (the stuff you hate) adhere to your fuel tank. MarineTex is epoxy, too. Then again, it might be vinegar.
Thanks for the link 18R. I've already coated the bottom and sides. Boy, that liquid Marine Tex (clear) is just about as snotty as the paste. I tried to sand down the white putty patches b4 I applied the LMT and I will say MARINE TEX is TUFF.<br /><br />I sanded down the whole tank (after patches) with 180 grit, used straight vinegar to wash it then wiped it with acetone b4 I applied the LMT. It looks like it will be a great coating for the tank. If anyone ever buries a new aluminum tank or exposes an existing one, they should definitely coat it with this stuff. It is flexible as well as being extra tough and impervious to corrosion.
 
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