leaking gas tanks

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1972Challenger

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« Reply #25 on: July 20, 2011, 07:32:24 AM »
ok so im now in the process of buyin my materials and i got a few easey quesions for u guys..

how do you fiberglass.??
and where do u buy the stuff at..

im going to be putting in 3 wood mounts in my boat and i want to fiber glass them in. then i want to mount the tank to those.... in 3 spots
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75 fantasy

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« Reply #26 on: July 20, 2011, 08:09:06 AM »
when i did my sub-floor i got the all the materials from westmarine less wood. they also had a nice how-to fiberglass book. most chain auto part stores sell glass kits and you can get how-to info off the net. glass work wasn't as hard as i thought it was going to be.  :thumbup:
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1972Challenger

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« Reply #27 on: July 20, 2011, 09:55:42 AM »
ok cool.. ill check the marine store near me
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sandeggo

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« Reply #28 on: July 21, 2011, 05:58:33 AM »
Make sure you space any wood away from the boat itself, if you glass wood directly to the boat with a tight fit you'll be dealing with stress cracks

1972Challenger

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« Reply #29 on: July 21, 2011, 11:19:01 AM »
so i cant glass wood to the boat??? like wat i was goin to do is put 3 pieces of wood to hold down my tanks and i want goin to fiber glass them to the floor and the side of the boat...
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ka0tyk

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« Reply #30 on: July 21, 2011, 11:46:30 AM »
so i cant glass wood to the boat??? like wat i was goin to do is put 3 pieces of wood to hold down my tanks and i want goin to fiber glass them to the floor and the side of the boat...


build up some small blocks to keep the tank off the floor and level. sand the area with like 80 grit to rough it up, put some resin down, then the block, and then a little run of some mat around that and resin to coat.   id personally put some rubber on top of those so there isnt tank to metal...  but thats just me.   then u can either get flanges to the gunnel, or just fiberglass something to hold em to a gunnel. 


1972Challenger

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« Reply #31 on: July 21, 2011, 02:06:40 PM »
how many coats or resin and the matting do i need??
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1972Challenger

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« Reply #32 on: July 21, 2011, 02:11:17 PM »
this is my idea for my tanks....

attatched is a pdf of the tanks
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sandeggo

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« Reply #33 on: July 21, 2011, 03:08:53 PM »
so i cant glass wood to the boat??? like wat i was goin to do is put 3 pieces of wood to hold down my tanks and i want goin to fiber glass them to the floor and the side of the boat...
Yes you can, you gotta space it about a good 1/8". Set it with spacers, glass in between the spacers and let it set up. Then pull the spacers out and glass until your heart desires. It's called tabbing. If you are only doing blocks only on the floor and not the floor and gunnel then don't worry about it. You need to tab things that attach at more than one surface

1972Challenger

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« Reply #34 on: July 21, 2011, 03:25:31 PM »
Yes you can, you gotta space it about a good 1/8". Set it with spacers, glass in between the spacers and let it set up. Then pull the spacers out and glass until your heart desires. It's called tabbing. If you are only doing blocks only on the floor and not the floor and gunnel then don't worry about it. You need to tab things that attach at more than one surface

what do u mean i need to tab things that attatch to more then one surface??

are u talkin about the tank? or fiberglass??




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sandeggo

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« Reply #35 on: July 21, 2011, 10:09:53 PM »
Like if you were glassing a bulkhead in. It touches the floor and the inside of the gunnels.

ka0tyk

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« Reply #36 on: July 22, 2011, 12:02:20 AM »
what do u mean i need to tab things that attatch to more then one surface??

are u talkin about the tank? or fiberglass??

what he basically means is that you use a strip of glass mat.  and lay it out so theres an overlap onto the new piece and what you're trying to stick it to. 

for example:



theres like 4" on the stringer part, and 4" on the floor.  both sides. 

IRRebel

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« Reply #37 on: July 22, 2011, 12:39:19 AM »
what he basically means is that you use a strip of glass mat.  and lay it out so theres an overlap onto the new piece and what you're trying to stick it to. 

for example:



theres like 4" on the stringer part, and 4" on the floor.  both sides.

Exactly how I was reading it as well. Glass in the wood mounts, then simply mount or secure the tanks to those. Haven't done it.......yet, going to happen here quick, but I plan on three layers glassing the wood mounting points in. cloth, then mat, then cloth again.  spreading out a little further each layer.

Reason being, say an 11 gallon tank holds 72 lbs of fuel, plus the tank. A Half or partially full tank, sloshing around, can emit quite a bit more force than that, so I am working on a side load capability of 150 lbs or more.

You're on the right track! You cannot over secure them.

Ray
"Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways totally worn out shouting 'Holy Shit what a ride!"---Crewcheif22 AKA Keith

sandeggo

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« Reply #38 on: July 22, 2011, 04:15:53 AM »
Ok not the greatest pic but here's my tank mounts, see how they attach at the floor and at the side of the boat. There is a 1/8" airspace between the wood and the existing fiberglass of the boat. If the wood touches it will spider crack the outside of the boat. It's the same on the bulkhead and the same reason that the bulkhead and side supports don't touch the underside of the deck. It allows it all to flex. Derek and ray are right, you want to roll out some mat under the piece so that it sticks out on either side parallel with the joint, then glass the 90 degree sides. On mine I used about 4 layers of heavy mat and a finish layer of cloth. One other thing I did that seemed to help is I routered or sanded a little bevel on the wood piece which allowed the resin and mat to "flow" better.


Sorry these are the best I've got
« Last Edit: July 22, 2011, 04:31:11 AM by sandeggo »

1972Challenger

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« Reply #39 on: July 22, 2011, 07:04:44 AM »
thanks for all the info...

the way im mounting them is with 3 2x4s pcs, about 5'' long, on the boat... the old tanks that were in there were built in tanks, and there is a step of glass in the boat for the old tanks. so what i was goin to do is put the pieces of wood on that, glass them down, and bolt up my tanks to that....
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sandeggo

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« Reply #40 on: July 22, 2011, 10:56:12 AM »
Sweet

1972Challenger

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« Reply #41 on: July 31, 2011, 10:18:07 PM »
ok so i went to buy the fiber glass and the guy asked me what kind do i want..??

sooo what kind do i want??

i mean what is used in boats?

thanks
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sandeggo

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« Reply #42 on: August 01, 2011, 04:29:33 AM »
I'm no glass guy but the way I understand is mat is where the strength is, and cloth is for smooth finishing

ka0tyk

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« Reply #43 on: August 01, 2011, 11:06:07 AM »
I'm no glass guy but the way I understand is mat is where the strength is, and cloth is for smooth finishing

i used a biaxial cloth with a mat backing.  i dont remember the oz in the mat, but it wasnt too thick.  i used some epoxy and radius'ed all of my 90* corners.  fiberglass doesnt do a 90* corner very well... 

covered the area with poly resin, layed down my fiberglass, poked it into little nooks and crannies, took my brush and saturated it until it was somewhat translucent.  then took a roller and rolled out the excess resin and air bubbles. 


you could pick the boat up by my seat frames...

 


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