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Author Topic: Paint INSIDE my gas tank  (Read 1506 times)

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Offline Toolmaker

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Paint INSIDE my gas tank
« on: March 28, 2015, 01:20:38 PM »
Ok so I finally have my carbs put back together after having to manufacture some new jet springs and throttle arm springs and now I have to tackle the gas tank. Apparently the last person who painted the tank many years ago thought it would be just a WONDERFUL idea to paint the inside of the gas tank. Now I have paint peeling off inside and its thick paint too. Idk whether to put some paint thinner in there or what. The outside of the tank looks pretty nice and I would hate to spill any sort of thinner on it. Whats the best solution?


I added pics of my machine shop made carb springs I was in search of a few weeks ago
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Offline Steve_K

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Re: Paint INSIDE my gas tank
« Reply #1 on: March 28, 2015, 01:34:21 PM »
Could it be a tank liner that is coming off.  It is not hard to remove as other members have done so.  Would have to reline if tank has holes.  Best done before painting the outside.
Steve
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Offline calj737

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Re: Paint INSIDE my gas tank
« Reply #2 on: March 28, 2015, 02:37:18 PM »
+1 to it possibly being a liner... Post a picture?

Wrap the tank in Saran wrap and use blue painters tape to secure it. This will protect your paint (don't skinp on wrapping it). If it is indeed paint, or a failing liner, fill the tank with Acetone and let it soak. Acetone is not cheap ($15/gallon) but it's been my go-to fro removing a liner. I fill the tank to the top as well to insure I get the underside of the top in a single soak. Remove petcock and drain the tank into a pail.

If it was a liner, best to discover why it was installed originally. Small holes may be exposed now and the paint job will suffer from gas leaks. Could be some trapped rust under the paint/liner. Just got to explore the real story...
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Offline eigenvector

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Re: Paint INSIDE my gas tank
« Reply #3 on: March 28, 2015, 03:02:23 PM »
+2 to that liner.

If it's white, then very likely Kreem.  I used to think it was a good way to fix a rusty tank - it isn't for this very reason.
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Offline Toolmaker

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Re: Paint INSIDE my gas tank
« Reply #4 on: March 28, 2015, 04:59:17 PM »
Its yellow which is the exact same color as the outside of the tank. It looks as if they took the spray gun and waved it around the inside to spray it. I intended on putting a liner in there anyway to help preserve it. Ill try the acetone trick and see what happens! Ill let it soak a week and drain it out and hopefully all the paint will be dissolved.
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Offline P.abrera

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Re: Paint INSIDE my gas tank
« Reply #5 on: March 28, 2015, 05:13:12 PM »
If it is paint, i had the same problem azhal epoxy primer used INSIDE the tank as a third world liner of sorts there was only one way to take it all out...


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Offline Toolmaker

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Re: Paint INSIDE my gas tank
« Reply #6 on: March 29, 2015, 06:38:01 AM »
Yea the paint is on the left part your pictured tank. Its peeling on top of the hump. Im going to get pics here in a few once I find the key.
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Offline Toolmaker

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Re: Paint INSIDE my gas tank
« Reply #7 on: March 29, 2015, 06:39:12 AM »
I also had a friend tell me to use MEK to thin the paint out.
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Offline calj737

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Re: Paint INSIDE my gas tank
« Reply #8 on: March 29, 2015, 06:41:55 AM »
That works too. Real MEK is pretty toxic stuff, so be mindful. And it will eat your paint on the outside if your spill it.
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Offline Toolmaker

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Re: Paint INSIDE my gas tank
« Reply #9 on: March 30, 2015, 09:48:36 AM »
Awesome, Ill try and get some today.
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Offline SOHC4 Cafe Racer Fan

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Re: Paint INSIDE my gas tank
« Reply #10 on: March 30, 2015, 11:54:20 AM »
You can also take it to a radiator shop and they will clean out any residual paint or prior coating, then pressure test the tank.
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Offline Toolmaker

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Re: Paint INSIDE my gas tank
« Reply #11 on: March 31, 2015, 03:49:32 AM »
Aaaahh ok! I snagged a pic on my old ladies phone. Ill see if I can get her to send it to me so yall can see!
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Offline calj737

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Re: Paint INSIDE my gas tank
« Reply #12 on: March 31, 2015, 04:24:29 AM »
Quote from: CB750 Cafe Racer Fan on March 30, 2015, 11:54:20 AM
You can also take it to a radiator shop and they will clean out any residual paint or prior coating, then pressure test the tank.
But this method destroys the exterior paint, no?
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis
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