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Thread: Gas tank sealant removal

  1. #1

    Gas tank sealant removal

    Help!
    I'm restoring an R75/6. Whoever had it before me, coated the inside of the tank with some kind of sealant. It's flaking off and I'm trying to figure out how to remove it. I went onto YouTube, and all the videos said to use acetone so I tried it. The acetone made the sealant soft but didn't disolve it. Does anyone out there have any ideas?

  2. #2
    Registered User lmo1131's Avatar
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    Welcome aboard potman!

    Acetone by itself won't "strip" the coating... throw in a hand full of drywall screws, nuts, etc. to help abrade the interior.

    I used the "POR-15" relining "system" on my /5 tanks. The solvent used by them is based on methylene chloride ... nasty stuff, but it strips coatings really well.

    Dad's brand paint stripper is basically the same stuff, only much thicker.



    A WARNING... Both of these products will DESTROY the paint finish on the outside of the tank.
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

  3. #3
    Liaison 20774's Avatar
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    Welcome to the forum! Snowbum has a page on this:

    http://bmwmotorcycletech.info/fuelmiscl.htm

    Basically, you're going to put into the tank an array of nuts and bolts followed by vigorous shaking, draining, repeating. Probably need to remove the petcocks and plug with some rubber stoppers. Certainly don't want the petcocks on when applying the new sealant.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  4. #4
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    Oh Man: I just went through this on the tank for my sons' 83 seca.
    Pin hole leaks below the petcock line.
    Very long story shortened:
    Acetone softened the factory sealer and trapped the screws I had put in to loosen the crud.
    Final solution was 2 gallons of MEK and a 3 day soak.
    It WILL mess up the paint.

  5. #5
    Quote Originally Posted by lmo1131 View Post
    Welcome aboard potman!

    Acetone by itself won't "strip" the coating... throw in a hand full of drywall screws, nuts, etc. to help abrade the interior.

    I used the "POR-15" relining "system" on my /5 tanks. The solvent used by them is based on methylene chloride ... nasty stuff, but it strips coatings really well.

    Dad's brand paint stripper is basically the same stuff, only much thicker.



    A WARNING... Both of these products will DESTROY the paint finish on the outside of the tank.
    Thanks for the info Imo1131. The paint stripper is a great idea. Potman

  6. #6
    I had a BMW friend who took a piece of glass and broke it up into tiny little pieces with "sharp" edges and then put in tank and shook up like those have suggested above. He claims it worked well.
    "The difference between death and taxes is that death doesn't change every time congress meets." - Will Rogers

  7. #7
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    My opinion is to use the larger proportions of "POR 15" that are suitable for automotive tanks.

    The smaller kit that is sold for motocycle tanks have the right quantities for a motorcycle tank in a perfect world. Not this one.

    Charlie

  8. #8
    Registered User lmo1131's Avatar
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    The smaller kit that is sold for motocycle tanks have the right quantities for a motorcycle tank in a perfect world. Not this one.
    +1

    I should have mentioned that. "Dad's" works well although it's a bit thick, dilute with acetone to desired consistency. And WEAR EYE PROTECTION AND GLOVES this stuff is will burn skin.
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

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