Just to be clear: Petit Barnacle Barrier on shaft as well as prop?

[NightSky46]

It's funny, I am pretty literal and when I read or see things it bugs me to have to assume an answer particularly when its possible to screw something up. 60+ years ago my Drill Instructor taught me how to spell assume: makes an ASS-out of U-and ME. I haven't forgotten since because they have ways to make sure you don't. So every time I assume something that ends up going pear shaped Gunnery Sgt Radigan's voice tickles my brain: "Maggot, how do you spell assume?"

I watched the Petit how-to video and all they show is painting the prop with barnacle barrier 1792. Nothing about the shaft and nothing said either. Yet at the end it looks for a second like SS shaft was painted too. Do you paint it or not? I assume (wince and cringe) the prop shaft is running gear, but why not just say so? If yes, considering the difference in metals, is prep and interval between coats the same?

[Cheechako]

Yeah paint it all but not under a zinc!

[NightSky46]

Love it! Thanks. Clear, inclusive, definite, concise. Paint it, I shall.

[GordMay]

➥ https://pettitpaint.com/media/4176/p...-1-18-2018.pdf

[Chuck34]

Originally Posted by Cheechako

Yeah paint it all but not under a zinc!

And don't paint the zinc either.

[Paul L]

Yep, it will have a similar short functional life on the shaft as on the prop. Fortunately the stuff is cheap and easy to apply and better than nothing. The Rustoleum brand and Pettit are both owned by RPM. So you might get the zinc spray cheaper with a Rustoleum label on it.

[Chuck34]

From everything I've read, Propspeed is probably the best running gear paint you can buy, but it is expensive and labor intensive.
Pettit Zinc Coat does a pretty good job, definitely better than regular bottom paint. It's also easy to use and cheap, especially, if you buy the Rustoleum brand at your local hardware.

[Viking Sailor]

Originally Posted by GordMay

➥ https://pettitpaint.com/media/4176/p...-1-18-2018.pdf

Topcoat Application: To extended the service life of Prop Coat Barnacle Barrier in order to achieve multi-season performance, Prop Coat Barnacle Barrier maybe top-coated with any Pettit Antifouling Paint. When top-coating Prop Coat Barnacle Barrierwhich has been applied to aluminum surfaces, always use a non-cuprous oxide antifouling paint such as Vivid, Black Widow, ECO HRT, or Hydrocoat ECO to prevent the possibility of galvanic corrosion from occurring. Follow the Topcoat times shown in the table above.

What Topcoat times?

[GordMay]

Follow the Pettit link:

Dry Time (Hours) Liquid
Temp - To Recoat - To Launch
90°F - ½ - 1
70°F - 1 - 2
50°F - 2 - 4

Dry Time (Hours) Aerosol
Temp - To Recoat - To Launch
90°F - ½ - 16
70°F - 1 - 24
50°F - 2 - 48

[ranger58sb]

Originally Posted by NightSky46

Nothing about the shaft and nothing said either. Yet at the end it looks for a second like SS shaft was painted too. Do you paint it or not?

Agreeing with others: yes, paint the shaft, too... best on bare metal, not over preexisting paint, if any. Don't paint for under any zincs, though, and don't paint the zincs.

-Chris

[Sail Away Mom]

Ditto! ��

[jmschmidt]

I first heard the ASSUME drill from a marine too.

But the answer to your question is simple. Today the people that design everything from high tech software for the Boeing 737-MAX8 (or even low-tech stuff) including everything from print and photo advertising, to operator manuals for the products of big companies, like Petit, rarely have any knowledge of the subject or discipline they are designing for. For software this is supposed to be taken care of during alpha and beta testing. Too bad the beta testing for the MAX8 had to cost the lives of 350.

[Quadrille in JB]

Originally Posted by Chuck34

From everything I've read, Propspeed is probably the best running gear paint you can buy, but it is expensive and labor intensive.
Pettit Zinc Coat does a pretty good job, definitely better than regular bottom paint. It's also easy to use and cheap, especially, if you buy the Rustoleum brand at your local hardware.

Prop speed is definitely expensive but labor intensive??
You have to apply 2 coats within 3-5 minutes. Entire process takes less than 15 minutes. Timing is critical between coats. I just applied it last week, so I don’t have a track record yet.
Petit barnacle buster was useless in our high growth area.

[Paul L]

Originally Posted by Quadrille in JB

Prop speed is definitely expensive but labor intensive??
You have to apply 2 coats within 3-5 minutes. Entire process takes less than 15 minutes. Timing is critical between coats. I just applied it last week, so I don’t have a track record yet.
Petit barnacle buster was useless in our high growth area.

You didn't include the time to take the prop, sbaft and strut down to clean metal.
Propspeed is pretty pricy in the US. It is more reasonable in NZ and Aust. Certainly you can buy a lot of cans of Pettit spray for one application of Propspeed. Either way, Propspeed seems to work pretty well for us for maybe 6 or 10 months. The Pettit/Rustoleum spray was a little useful for 4-6 months.

[flyingpumpkin]

Originally Posted by Cheechako

Yeah paint it all but not under a zinc!

why can you not paint a zinc with zinc galvanizing paint? I get not painting a zinc with a typical antifouling paint and I have been taping off but why exactly would paining a zinc with zinc be a bad thing?