Looking for a maintenance paint for steel

Discussion in 'Metal Boat Building' started by Aneblanc, Oct 6, 2012.

  1. Aneblanc
    Joined: Nov 2011
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    Aneblanc Junior Member

    I am looking for a paint to touch-up rust spots until I can get a proper job with the flap disk and the Amerlock 400.
    Probably a one component paint, not a water soluble paint as it is not easy to clean up the equipment at anchor, something that would attach well to different undercoats.
    Any experience with Rustbullet? (I don't even know if this is available in Nova Scotia)
     
  2. pauloman
    Joined: Jun 2010
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    pauloman Epoxy Vendor

    google aluthane. note it can only be shipped to US locations. Can apply down to about 40 degree F

    paul oman
     
  3. hoytedow
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    hoytedow Old Woodbutcher

  4. Aneblanc
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    Aneblanc Junior Member

    Are you involved with the company?

    Sounds very much like Rust Bullet: an aluminium polyurethane paint. Could the rust/paint specialists comment on the two products. Their claims sound too good too be true. There must be some drawbacks somewhere!
     
  5. pauloman
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    pauloman Epoxy Vendor

    aluthane is an mcu - moisture cure urethane, which is very different from a regular urethane or an lpu (linear polyurethane)
     
  6. PAR
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    PAR Yacht Designer/Builder

    Paul, can I assume the Aluthane is an aromatic isocyanate reaction opposed to aliphatic and or cycloaliphatic ? Even so, would the more reactive iso still be moisture vapor cured, particularly compared to the ortho side?
     
  7. gonzo
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    gonzo Senior Member

  8. pauloman
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    pauloman Epoxy Vendor

    the MSDS shows the aluthane mcu to contain a polyisocyanate. Note that 2 part LPU polys (like awlgrip) are isocyanate based. I was surprised to see the one part (moisture cured) aluthane mcu is also similar.

    Especially since the weak link of LPU coatings is their adhesion while adhesion is the strong point of MCU coatings.
     
  9. PAR
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    PAR Yacht Designer/Builder

    That's interesting Paul, so it is a aliphatic (Aluthane MCU) and the interesting part is these formulations aren't as common because of the higher costs associated with them, but more importantly, that the aromatic iso's typically have a better grip. I'd like to see the formulation for that stuff. The MSDS suggests what I suspected, a high isocyanate formulation, but certanily not enough details to see what's going on. The aluminum content is about what I expected too, do you have a particulate size and shape available? I'll assume they're flat plate like structures, but a size?
     
  10. pauloman
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    pauloman Epoxy Vendor

    aluthane comes in quarts and gallons. MCU coatings are common in places that cannot be prepped the way they should. If you get some on you and don't remove in the first few minutes, you wear it for a few days (I sometimes have a silver nose!). Get it in the rim of the can you will will not be able to remove the lid later. It also hardens in the open can unless you spray in propane etc. to displace the air - then saran wrap between the lid and the can. Best to just save up projects and use up the entire amount.

    Used a lot on bridges, boat lifts, aluminum boats, etc. I like it as a primer on wood, fiberglass or metal. Probably nothing better for repainting outboard motors (topcoat with enamel in the color you want). Can be applied at about 40 degrees and handle about 300 degrees temp.
    Don't have specs on the alum used. It is aluminum flakes so they stack on each other forming a tough barrier as the solvents flash off and the film thickness decreases. The result is a semi flat light gray finish, but if you sand it, the al flakes curl and the color changes to dark gray. Really nice as it shows 'high spots'.

    the general public knows nothing about mcu coatings and once folks try it they keep coming back. I have a large equipment company now buying 50-100 gallons a month.

    I am an epoxy vendor, but I like this more than epoxy for priming and sealing - much esier to work with too - but high solvent (if it were not classified as a metallic coating, it would not be sellable in any part of the USA because of the high solvent levels. Metallic coatings are allowed a much higher level of solvent - even in southern calif (I suspect they just overlooked and forgot to regulate the tiny metallic coatings niche market). but the result is I can sell the aluminum filled aluthane mcu, but not the plain mcu coating that might allow the use to add say copper powder or other pigments.

    hope this explains things a bit without being a 'commercial plug'

    paul
     
  11. Ilan Voyager
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    Ilan Voyager Senior Member

    Paul, thanks for all this good information. I had an old prejudice about moisture cured polyurethane. I must give a try...
     
  12. goodwilltoall
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    goodwilltoall Senior Member

  13. pdwiley
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    pdwiley Senior Member

    Get real. Not even close.

    If I could get that aluthane stuff locally I'd give it a try, for sure. I'm quite happy with the Jotun 605 I'm using but a single pack paint would be simpler than mixing 2 pack stuff.

    PDW
     
  14. Aneblanc
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    Aneblanc Junior Member


  15. pauloman
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    pauloman Epoxy Vendor

    PAR - if you have a good place to test or use, I'll get you a free quart of the aluthane so you can be an unbias reporter on performance etc. Remember it doesn't store well so line up a few test projects in advance and use the entire quart - covers about 100 sf.

    paul
     
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