Paint is throwing bubbles on the tank - Help!

Discussion in 'General VFR Discussions' started by irishrOy, Nov 29, 2017.

  1. irishrOy

    irishrOy New Member

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    Sorry for "necro"-ing the thread but:

    Okydoke, so over the christmas-days I have gotten around to pry away a few small paint-chips of the biggest bubble and well:

    There are no big signs of rust anywhere to be seen. The metal under it is grey with just a slight touch of greenish/blue but it might have just been the light. Either way, no signs of rust, dirt, corrosion or damage done by fumes of gas pushing through the metal.

    Although I don't think the tank as a whole has been repainted (because the bike's paint looks really well and I can't tell a difference between my Viffer and other silver Viffers), I think the previous owner might have had it repainted on certain parts or maybe the shop he took the VFR to to do the maintenance dropped a few splashes of not so paint-friendly liquid on the tank (I have the suspicion the shop-owner might not be the most careful one. And he seemed to have charged the previous owner too much for small stuff like chaning the oil, brake&clutch-fluid and the sparkplugs).


    Either way:
    I think I'll just order a "touch-up" kit with some paint and clear coat and go at it, sand down the damaged area and repaint it.

    Should I invest in some primer while I'm at it, too? Do they really do their job and prepare the metal/groundwork for the paint to stick to the metal?

    Is it recommended or even worth it to go through the hassle and put some rust-prevention-stuff like Brunox under the primer? (so the layers would be tank>anti-rust>primer>paint>clear coat).
     
    Last edited: Dec 30, 2017
  2. Diving Pete

    Diving Pete Insider

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    Put pqr-15 IN THE TANK.
    Follow the instructions carefully.

    There is no downside to doing this, it's cheap, & easy.

    Then very carefully sand down the damaged area - you may have to remove the sticker which will add a whole more pain to this job.

    IF you have to remove the stickers then you may as well paint the whole thing ....

    Hi-build Primer
    base,
    clear

    Your real problem is that any repair will be noticeable every time you sit on the bike...
     
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  3. irishrOy

    irishrOy New Member

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    So I take it right that you have to take off the tank, empty it, put the pwr-15 in the tank and slosh it around until it's finished?
    Do you recommend getting these "3-stage packs" from POR where you first degrease the tank, then prime it and then put the por-15 in the tank in the end?
     
  4. Diving Pete

    Diving Pete Insider

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    Yep, that's the ticket..
     
  5. ClockworkOwl

    ClockworkOwl New Member

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    I'm not a mechanic - I'm in the metals business. Any touch up pen/paint, especially from a 3rd party vendor will not look correct and will bug the crap out of you every time you step up to the bike. The metallic flake will especially never look the same.

    There's no easy fix here, just what you are willing to live with.

    Even a complete tank sand, prime, spray, clear coat will not match the rest of the original paint on the fairings. Probably close but especially that mica flake... it won't be exactly the same.

    Self touch up paint = long distance masking
    Professional touch up = probably much better but noticeable to you
    Professional complete repaint = Expensive, you will still be able to tell
    New (used) Tank matching original color and year = Probably expensive, hard to find
    Tank Bag = €30

    Good luck bruvah!
     
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  6. irishrOy

    irishrOy New Member

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    thanks, man, will need it! :D

    A Tankbag is a really good suggestion, man! How come I didn't think of this earlier? :D
    I might get one so I won't have to look at the touched up spot all the time!
     
  7. Diving Pete

    Diving Pete Insider

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    Be sure to coat the inside of the tank anyway...
    At some point you will remove it... lol
     
  8. irishrOy

    irishrOy New Member

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    for sure, man! I plan on doing it this summer. In fact, I'll get to ride my Viffer on June or July 1st if all goes well and soon after that I'll get that shit coated :D
     
  9. 2027Matt

    2027Matt Insider

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    Be very careful when you coat the tank. You must follow the directions exactly. If you don't, you may have flaking inside the tank! Then you will have real problems.
     
  10. irishrOy

    irishrOy New Member

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    I think I'll do it together with a buddy of mine who's more experienced or give it to a small garage and have them do it.

    I know how important a proper coating inside the tank is, I don't want to have it messed up by my sloppiness xD
     
  11. Vegeta2410

    Vegeta2410 New Member

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    Warum willst den Tank denn von innen versiegeln? Das Risiko das der Mist hinterher abblaettert und in den Sprit kommt und dir die Benzinpumpe und Duesen versaut ist zu hoch. Schau ertmal nach ob da Rost im Tank ist, dann kann man weitersehen.



    Cheers
     
  12. Diving Pete

    Diving Pete Insider

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    Because the chance of that happening from externally is really small.

    I agree - look inside the tank - use a inspection mirror or cable camera to check ...

    If no rust then don't bother, just fix the outside.

    If rust then remove the fuel pump from inside the tank BEFORE doing it.
     
  13. Vegeta2410

    Vegeta2410 New Member

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    Unfortunately I cant see the pictures anymore but given that you speculate rust on the inside is causing the paint on the outside to bubble I would not use the tank anyways because it wouldn't hold during a pressure test.
    Time, money, risk of flaking on the inside and the unknown if that damn thing even holds....its easier to get a new tank at the scrapper or get one online.
    Just my 2 cents
     
  14. irishrOy

    irishrOy New Member

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    Weil wenn der Tank gscheid versiegelt ist, die chance auf rost "für immer" gegen null geht.
    Yep, exactly! :D

    Thanks for the tip with the mirror, I think I've still got an old dentist's-mirror lying around somewhere, that should to the trick.
     
  15. irishrOy

    irishrOy New Member

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    To be honest I have siphoned out the gas the previous owner had in the tank and there were no rust-flakes in it. (I speculate it is more than 1, maybe 2 years old with no fuel-stabilizer. I noticed this because the motorcycle was startindg and idling badly. Now that I have filled up and used up 2 tanks of fuel the motorcycle starts and runs better).

    But once I'm kinda low on fuel I'll have another detailed look inside the tank for sure! :)
     
  16. irishrOy

    irishrOy New Member

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    IMG_20180616_155001.jpg IMG_20180616_171141.jpg IMG_20180616_155943.jpg IMG_20180616_165716.jpg

    Okydoke, so yesterday I finally got around to patch up the second one, the smaller bubble.

    Now the big one and the smaller one are done. I can spot a few other small irregularities, but I don't worry about them.
    IMG_20180616_155001.jpg IMG_20180616_171141.jpg
     
    Last edited: Jun 17, 2018
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