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gasoline and paint

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larry(at)macsmachine.com
Guest

Posted: Sun Apr 08, 2007 2:35 pm Post subject: gasoline and paint

Hi guys,

I just found something that may interest you that

have painted planes.  I have an overflow from the header

tank at the extreme right side of the center section.  I  managed

to see a little paint that was crinkled near the fitting and realized

the fitting had not been tightened.  The minor seepage was stopped

by tightening, but touch up will be required.

An RV in the next hangar also has paint coming off and we've

concluded that even just a little automotive fuel will dissolve nearly

any catalyzed paint there is, so it's prudent to cover your filler

with an apron before filling.  I do this and fortunately the topsides

are fine.  The 6-inch area around my over flow is another matter.

Guess I'll have to get out the little roller and have at it.



Larry McFarland - 601HDS at www.macsmachine.com

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cscsail(at)gmavt.net
Guest

Posted: Mon Apr 09, 2007 4:08 am Post subject: gasoline and paint

Larry,

    That's very disappointing, I'm using the same paint. I don't think that 

this would happen with all 2 part urethanes though. I've used Awlgrip quite 

a bit and the only way I've ever been able to damage a fully cured coat is 

mechanically (abrasives).

    I went with the Steward system because it seems safer, for me and the 

environment, but I would hate to thing that gasoline, would damage it. With 

sticking tanks for fuel level, draining tanks, tank venting and fueling, 

there are a lot of opportunities for gasoline to destroy a paint job.

The Steward System performance data says:

OIL RESISTANCE - Half immerse test panel in Transformer oil conforming to 

CSA



Standards C50 at 100oC(212oF)(+/- 1o) for 120 hours. Remove and wipe with a 

clean



lint free cloth. Allow panel to cool for 2 hours. No softening, surface 

disintegration,



wrinkling, blistering, or loss of adhesion.



I would have thought that gasoline would be no more effective at destroying 

the paint.

Gordon



---

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larry(at)macsmachine.com
Guest

Posted: Mon Apr 09, 2007 6:30 am Post subject: gasoline and paint

Gordon,

I use a towel and plastic to protect my canopy and surround the painted 

area near the filler

and have had no problems there.  The drain fitting had not been 

tightened and allowed over flow

from rough air or expansion after filling to drip and spread around the 

fitting under the skin. 

If the fitting had been tight, I doubt the paint would have been wet so 

long as to damage it.

It is probably something more to do with the alcohol found in gasoline 

as I burn auto fuel most

of the time in the Subaru.  My friends RV7 lost paint at the filler when 

auto fuel spilled on it.

His is a fully catalyzed urethane like any other, not the Stewart 

systems paint.

In retrospect, I'd not over fill a tank or have less than an inch of 

overflow tube hanging below the wing

and I'm making a special apron with a hole and part of a funnel in it 

for refueling to catch the drops

and splash from filling.  Aside from that, it shouldn't be a problem.



Larry McFarland



Gordon wrote:

 	  Quote: 	
		   



 Larry,

    That's very disappointing, I'm using the same paint. I don't think 

 that this would happen with all 2 part urethanes though. I've used 

 Awlgrip quite a bit and the only way I've ever been able to damage a 

 fully cured coat is mechanically (abrasives).

    I went with the Steward system because it seems safer, for me and 

 the environment, but I would hate to thing that gasoline, would damage 

 it. With sticking tanks for fuel level, draining tanks, tank venting 

 and fueling, there are a lot of opportunities for gasoline to destroy 

 a paint job.

 The Steward System performance data says:

 OIL RESISTANCE - Half immerse test panel in Transformer oil conforming 

 to CSA



 Standards C50 at 100oC(212oF)(+/- 1o) for 120 hours. Remove and wipe 

 with a clean



 lint free cloth. Allow panel to cool for 2 hours. No softening, 

 surface disintegration,



 wrinkling, blistering, or loss of adhesion.



 I would have thought that gasoline would be no more effective at 

 destroying the paint.

 Gordon

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hillsgun(at)nwinfo.net
Guest

Posted: Tue Apr 10, 2007 4:00 pm Post subject: gasoline and paint

Hi all: I have been watching this topic and thought I would add my 2 cents 

worth. I painted comercial vehicles for about 15 years with at least 10 of 

them with catalized polyurethanes and urethanes. I suspect that the 

wrinkling in the paint is actually a fault of the primer used or the surface 

preperation rather than a failure of the paint. If there is any way for your 

gas to get thru the paint surface and down to the primer or metal surface it 

will soften or destroy the primer bond, the same will happen between the 

primer and metal surface if the metal is not prepped perfectly. Around the 

filler is the perfect place for this to happen because there are edges of 

aluminum, and rivets in close proximity. This area holds moisture, and 

contaminates when you clean, and etch and alodine, and then as you say the 

gas works on this area after the plane is completed. On comercial trucks I 

have seen a paint job which still looks good(good, not great) after 25 years 

using Ditzler Durethane, But I have also seen paint jobs which had the wrong 

primer, or poor surface preperation which after a month they started to chip 

and when you got under an edge you could peel paint off in pieces measured 

in square feet. Without knowing the exact process and materials used it is 

hard to tell the cause, but my opinion is that the polyurethanes are 

exceptionally durable and will stand up to almost anything short of really 

good paint stripper. The down side to them is that continued exposure will 

eventually end your life. Dan.

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